Oct 31, 2022 · The regenerative receiver is really just a crystal radio with an amplifier feeding RF back into the tank circuit. Part list: 200 pF variable capacitor. This receiver can be regarded as a QRP (low power) because the regenerative stage uses some microwatts in order to work. It works as follows. I don't know enough about radio to judge the Jul 8, 2008 · A simple AM BC band regenerative radio I constructed from junk parts. Hardboard sawing pattern. Project: 40V 3A Variable Power Supply; Pt. According to the documentation, this reduces spurious emissions and makes the regeneration control more stable. Today I picked up some parts to start the build of my N1TEV regenerative receiver. Radio regenerative short wave ini adalah pembaruan dari radio regenerative yang saya buat sebelumnya. Jan 1, 2021 · A simple regenerative receiver designed for the 40m amateur radio band with decent receiving capabilities, the perfect project for beginners in homebrew radi The QRPGuys K8TND Regenerative Receiver covers the 60, 49, 41, 31, 25 meter shortwave bands (approximately 4. The NEOPHYTE is a simple one-tube regenerative receiver that uses a 6U8A triode-pentode, a tube that found widespread use in the television industry as a VHF oscillator (triode) and mixer (pentode). 73, Jul 3, 2017 · Seventy-five years ago this month, the July 1942 issue of Popular Mechanics carried the plans for this simple one-tube regenerative receiver. It was invented in 1912 and patented in 1914 by American electrical engineer Edwin Armstrong. A good SSB-CW-AM regenerative receiver with a fine tuning by moving. In some areas 3 stages of audio amplification may not be necessary, in which case TR3 and its The next step was to move and permanently enclose all the components from the breadboard to a wooden board and voila, the TV tube regen radio was born. If there was too much feedback, the receiver would break into oscillation, which would result in Ron reminds us that MFJ still offers a shortwave radio kit. The incoming RF signal is taken from the antenna and passed through a tunable band-pass filter tank so as to select the desired channel. 5 to 11 mhz. Positive RF feedback is used to increase the RF gain of the amplifier upto and beyond self-oscillation. A good regenerative receiver. *PCBWay community is a shared platform and we are not responsible for any design issues. If you want to look at some nice construction work, see The WBR: A Simple, High-Performance Regen Receiver for 40m by N1BYT. Feb 1, 2012 · This particular receiver design comes from Charles Kitchin N1TEV. 25 watt audio amplifier that is configured for a voltage gain of 200 (which is its maximum). Depending on the tubes, the filaments could be powered by either batteries or an AC supply, while a 90-volt B battery supply was recommended. Following up on our recent MFJ post, SWLing Post contributor, Ron, writes: Another thing about MFJ is they still offer the MFJ-8100 as a kit or built. This is the only regenerative receiver available as far as I know. 75. One fea-ture of the AC powered K-1 is its use of a power transformer to provide operation from the AC mains, while preventing all the safety issues of AC-DC operation with direct connec-tions to the AC line. Designed by Charles Kitchen, N1TEVhttp://www. designing Home-Brew Regenerative Receiver and experiments with low voltage operation. The longer I worked on it the better it got, and the more Jun 20, 2021 · Trying a simple superregenerative receiver for 27 MHz that does a little bit more. 4 MHz to 8. You can view 30 of the 96 pages in the full issue, including the advertisments. You still see some of these in simple applications like RF remote controls. 5 to 10 MHz but had difficulty with SSB signals. Kali ini saya merakitnya secara full skema, dari mulai . Apr 25, 2017 · One Tube FM Super Regen Receiver - 12BH7A Tube Radio works with 12V DC. Simple FM Radio Receiver. It describes his first project building a simple regenerative receiver circuit using a printed circuit board. This link has been on our site since Monday Jan 28 2013, and it has been clicked on 2104 times. A schematic of the regenerative receiver is provided in Fig. Many designs for regenerative receivers are available and The regenerative radio receiver or, even super-regenerative radio receiver or, "regen" if you prefer, are basically oscillating detector receivers. It provides good general-coverage reception of the Nov 29, 2014 · Tuning around with an HF regenerative receiver. Product is in production. Fist of all, use capacitor as throttle regen control, this is the key factor for smooth regen control. Regenerative: 17. Although the regen is one of the oldest receiver designs, it’s still widely used in The receiver, dubbed 'The Moorabbin', is a two transistor regenerative receiver of conventional design. Its design is noncritical and the receiver is easy to get going. Dave, AA7EE, has done a wonderful job building this radio. use pre RF stage to reduce aeronautical effects, prevent antenna absorb the tank energy, isolation the detector, provide a Feb 8, 2012 · Homebrew: The N1TEV Regen Build – Part 1. There have been several popular Regen projects in recent QSTs and ARRL Handbooks Look at the design process and progress; then build one—or both—of the receivers described. I neglected to remember this, and as a result wired the tube pins backwards. C7 is the throttle-capacitor REGEN ADJUST control. Performance is ok, and with headph This is almost the final thing, my improved regenerative two-tube receiver, now with all the parts to make it a complete shortwave radio with several bands, The receiver, dubbed 'The Moorabbin', is a two transistor regenerative receiver of conventional design. I wound 60 turns of magnet wire that will form part of the tuned circuit with the variable capacitor. This compensates for lost energy, giving the radio an arbitrarily high Q factor and gain. The article notes that this The above circuit of this receiver is very simple. Reviews: 8. 7 MHz oscillator mixed with the incoming signal from the antenna, which I haven't seen on any other designs. One of the major problems with regenerative receivers is that they can radiate their oscillator if they are incorrectly adjusted; the interference is on the this stage, only 30 µW, with the use of a simple whip antenna makes this receiver easily portable and prevents it from inter-fering with other receivers located nearby. One valve regenerative receiver operates from 12 volts HT video 1 video 2. Jul 17, 2020 · The regenerative receiver is all about doing more with less. Also, tuning and controlling the regenerative feedback requires operator skill and technique. 6 Replies. It is an amplifier circuit that employs positive feedback (also […] Jun 13, 2014 · 1. 5 inch long and 4 inch diameter plastic Jan 21, 2021 · I have no experience with one-transistor receivers (yet), but very simple one-tube regenerative receiver is more than capable of receiving transmissions from all around the world in AM, CW and SSB Sep 30, 2022 · I have been experimenting with a very simple AM regenerative receiver discussed at circuitbasics. Used with circuit of figure 3, the loop can be brought to near resonance over the full tuning range of the receiver. *** BLOG POST: this stage, only 30 µW, with the use of a simple whip antenna makes this receiver easily portable and prevents it from inter-fering with other receivers located nearby. In addition to this kit, you will also need a simple wire antenna, a pair of common headphones and a 9 Volt transistor radio battery. use tickle coil as regen feed back, at high frequency this increase the feed back then improve the smooth. Simple circuit found in a Russian forum. youtube. I acquired this piece of "junque" some time ago because of the nice National S-101 audio inductor which is the type used by National in their famous SW-3. When the stage is teetering on the verge of and the complicated National cabinet by a simple aluminum panel and a wood chassis. The triode section is used as a regenerative detector, and the pentode section (wired as a triode) is used as a stage of audio amplification. For a 6 meter dipole, use a nine The Regenerative receiver has since become the most popular basic receiver for Amateur Radio Operators and Electronics experimenters worldwide. Some people are quite attached to “regens,” while Apr 8, 2022 · I wanted to build a radio receiver designed by N1TEV for a long time. Regeneration with a difference. He even made the case from PCB material. Some simple transistor receivers for the AM broadcast band. LF to HF converter 3. Below is the schematic of the final design. Its housing is a small cheese box. Feature: Computer Bits by Darren Yates. As the positive feedback of the stage is increased, at some point the tuned circuit resistance goes negative, massively increasing its Q ( Q = X/R). Apr 5, 2019 · SIMPLE REGENERATIVE RECEIVER 80 and 40 with one FET and a low component count. The radio is a very simple regenerative receiver described as a “student set. Tube repla Aug 29, 2023 · Sputnik Regenerative Receiver - SSB, CW, AM, FM. This receiver is suited for reception ofRead More The WBR Receiver. Receiver consists of a regenerative rf stage, TR1, followed by a two of three-stage audio amplifier, TR2 to TR4. The document summarizes Rich Bonkowski's home brew shortwave radio projects. This allows for maximum sensitivity with such a small antenna. Notes. 3) An LM386 0. Here’s the product description: 1 – 30 MHz with band spread tuning. Description: A simple 2 band regenerative radio kit capable of receiving signals from 3. 5V battery cell. The output of the detector drives an LM386 audio-amplifier IC. The amplifier's output signal is then fed back into the resonant Jan 20, 2017 · Dan Maloney. 30 pF variable capacitor. It is a restoration and update of an old Science Fair #28-110 kit from Radio Shack. Since there are really two valves in one glass envelope, the set is really a two-valve receiver. At low frequencies, a modest value of Q factor in a single tuned circuit achieved workable station selectivity which was CONSTRUCTING A 1930's REGENERATIVE RECEIVER. The design for this receiver was first published in the January 1933 issue of QST. His design is a modification of a classic design that dates back to the 1920’s. It uses 3 NPN garden type transistors and a LM386 as the audio amplifier. The old designation is therefore 1V2. Like most projects, this one went through several iterations. The greater the wire diameter, the higher is the Q to produce Main category is Regenerative Receiver that is about Regenerative Receiver. , 12V on the plate) Regenerative: 17. arrl. The Synchrodyne project left me with the mechanical framework for a simple broadcast-band receiver. The set was designed with wartime parts shortages in mind, and most parts were non-critical, and could be found in most junk boxes. the wooden stick with a grounded piece of PCB towards the coil. Many hams have tried regen¬ erative receivers with mixed results. Apr 20, 2018 · Original circuit from this site: https://www. It employs a reflexed regenerative detector to maximize gain from its simple design, followed by a two-transistor audio amp. This video describes a 1 valve regenerative receiver using a 12AX7 mains valve. Now that operational AM medium-wave transmitters are a rarity, the fact that it works in the FM broadcast band is a plus. According to the original post, should measure about 240 uH. It’s called the KRC-2. Mar 19, 2018 · 80m/40m 2-Band Regenerative Receiver Power by AA Battery 1. 1. org/forum/project_a_simple_one_valve_regenerative_receiver. A REGENERATIVE RECEIVER FOR BEGINNERS A modern version of the classic re- generative receiver is shown in Fig 17. com. In this case that was left out. In addition to the tube and plug-in coils, it includes a tuning capacitor, a variable resistor for the regeneration control, two fixed capacitors, one fixed resistor, and one RF choke. Here is a simple VHF receiver you can build without any special components or test equipment. The short-lived battery Apr 26, 2019 · The LM-386 audio amplifier makes a good minimalist regenerative receiver using about 10 components. The circuit is based on a design by EN Bradley for a pocket one-valve receiver, which used a 3A5 (DCC90) valve. Crystal radios used to be the “gateway drug” into hobby electronics. With a decent antenna it will produce speaker volume us Circuit Diagram. The receiver featured here is a regenerative type, with an RF amplifier stage (1), a detector (V) and two audio amplifier stages (2). Eventually I'll add more coils for HF basic operation of a super-regenerative receiver. 2. radiomuseum. The set is mounted on a 7×8 inch wood base. Lately I’ve been playing with a TDA2003 Apr 8, 2015 · This document provides instructions for building a simple regenerative radio receiver with a single FET and low component count. Trouble was, there’s only so much one can hope to accomplish with a wire-wrapped oatmeal #375 Three Transistor Shortwave Receiver. Any movement of the antenna or large objects near the antenna can change the tuning of the detector. The basic circuit is a pentode regenerative detector, with a triode audio amplifier providing useable headphone volume. D1 and C4 comprise a floating detector that pro- Aug 29, 2023 · Sputnik Regenerative Receiver - SSB, CW, AM, FM. The K-1 is a simple regenerative receiver us-ing three tubes as shown in Table I. I used a 6CG7 tube I found in a box of old TV tubes. The received signals at the tuned circuit's resonant frequency are The Ozark Patrol circuit is a two-band shortwave receiver, using only three NPN transistors in its circuit. This project was designed and built by Charles Kitchin. Like with the better valve designs, feedback is controlled by a variable capacitor. COMPONENTS LIST RESISTORS All 1/8 W carbon 1k0, 2k7, 1M0 10k Linear potentiometer CAPACITORS 15p ceramic*, 4p7 ceramic*, 150p ceramic, 50p polystyrene, 100p silver mica or polystyrene, 300p polystyrene, 0µ1 polyester film, 2 X 33µ 16v electrolytic Variable capacitor 208 + 176pF (176p section only used) * C1a and Apr 25, 2023 · The KRC-2 seems to be an unusual regenerative receiver, in that it uses a 10. Start with a 2’ x 4’ piece of 1/8” tempered hardwood. By the 455kHz IFT, it oscillates 455kHz. Review Summary For : QRPKITS Scout Regen Receiver. 7 MHz), with a receiver you build complete from the supplied chassis pieces, electrical components, and hardware. I found this design for a 3 Transistor Short Wave Radio by netZener. 6BA6 Regenerative Receiver [In Russian]. 73, YO6DXE. The receiver worked from 3. It is capable of operating from a simple wire antenna. It's very simple, comprising one NPN transistor and one LM386 IC audio amp A simple low-pass filter (R4 and C9) removes the quench voltage from the detector’s audio output. Regenerative receivers provide a surprising level of performance with only a handful of components. Apr 20, 2023 · This is a super-simple crystal radio that doubles as a regenerative receiver. 0: 6BA6, 0A2: 76: New 7MHz Valve Receiver: Schematic link is close to bottom of page. 0: 6AK5: 77: Homebrew Regenerative Receiver: He experiments with very low voltages (eg. https://www. Medium-Wave FET Regenerative Receiver. MSRP: 50. Sputnik regenerative receiver has decent receiving capabilities. It covers two bands with coverage from 3 to 23 MHz. The idea derives from how an oscillator works. See AA5TB Jan 22, 2016 · Regenerative receivers, like simple direct conversion sets, are not known for their single signal reception. 00. Tropicalized version of the famous "Desert Ratt", regenerative receiver for SWLs, hobbists, listeners and radio hams. HF radio receiving projects Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. With no input RF signal the internal noise peaks and a small Aug 19, 2022 · The TRF receiver can be nicely operated through just one 9 volt transistor radio PP3 battery. Check out some of his other postings, too. The receiver uses two transistors plus an IC. I have attempted to incorporate every improvement I have thought of into this receiver, including maximum mechanical rigidity and electrical shielding. Construction is also much quicker. These are relatively simple radios to build and they can receive any type of modulation, from AM to Single Sideband, to FM. No audio transformer is required anymore, the A Simple Regen Radio for Beginners. 2) The Armstrong regenerative detector with its tickler coil and throttle is, of course, the heart of the project. Regenerative AM receiver. In an article by QST's Assistant Technical Editor, George Grammer, "Rationalizing The Autodyne", the author promised " A Three Tube Regenerative Receiver of Unusual Performance ". It’s a simple regenerative receiver for the 40m band. In earlier days of radio, quite successful reception of low frequency radio waves was achieved with a single valve stage as a regenerative amplifier-detector and a valve audio amplifier. He really needs to make a better e-commerce web site. But is is possible? Watch this video and find High Performance Regenerative Receiver. A Medium-Wave FET Regenerative ReceiverSeptember 13, 2009. The circuit is a simple LC tank that includes a conductance G representing all the resistive losses in the circuit. To all extents, G=1/R , where R is the loss resistance. September 2000 61 By Charles Kitchin, N1TEV ere’s a low cost, simple-to-build, portable shortwave receiver. His website and ordering process are definitely old school. Cut a 7-1/4” strip across the 2’ width, then cut this piece at 7-3/4”, again at 4”, and finally at 3” (see Figure 2 ). You connect the receiver to a simple wire antenna, that can be a simple wire in the attic, or one thrown up in a tree. The WBR Receiver. Hackaday recently had a post called “ Everyone Should Build at Least One Regenerative Receiver “. It was housed in a repurposed metal Christmas cookie container. Vintage Radio: Building a simple 1-valve receiver by John Hill. Regenerative Receivers This web page describes a small, single tuned circuit regenerative receiver primarily for daylight reception in the 16, 19, 22 and 25 meter international shortwave broadcast bands. Thanks to my friend Henrik ( DK8HM ) for the PCB he sent me to build this receiver. Jue and his guys did a couple of tweaks like limiting The schematic of the radio receiver designed by N1TEV usually includes an LM386 audio amplifier. With it, you can receive dozens of international shortwave broadcast stations at night even indoors using a 39-inch whip antenna. Checking online I found that Far Circuits makes a board that is ready to go for this project. 2); this even- tually initiates an RF oscillation. As C7's capacitance is increased, more RF energy is coupled from Q2's drain to ground (and there- fore the ground end of 1. This kit is for advanced electronic hobbyists. Apr 8, 2015 · This document provides instructions for building a simple regenerative radio receiver with a single FET and low component count. The way it is configured, it is easy to tune, stable and fun to use. It was used between 1915 and World War II. Mr. This can be replaced with a 30 pF fixed cap, see the coil winding section. 34 August 2001 By Dan Wissell, N1BYT. The idea is that everyone can pick the audio amplifier they like. 45 How to Build the Twinplex Regenerative Receiver In 1934 a fascinating single-tube kit-form shortwave receiver was advertised in radio magazines. The tuned circuit is connected within the closed loop containing the two amplifiers of an LF353 integrated circuit package. This kind of receiver is easy (and fun) to build and has been used by many generations of hams to learn radio basics. Regenerative receivers are, after all, oscillators. It tunes about 470 - 1900 kHz, allowing reception of signals on either side of the AM broadcast band. Under the Attribution-NonCommercial-ShareAlike (CC BY-NC-SA) License. Once the tube is mounted, mark the tube pin configuration onto the breadboard keep in mind that the datasheets list the pinout as a bottom-view of the tube. It also outlines a TRF breadboard project using a single ZN414/MK484 High Performance Regenerative Receiver Design. The telescoping whip antenna is capacitively coupled via C2 to the high impedance end of the tuned circuit consisting of L1, C3, C4, C5, C6, and the polyvaricon VC2. Mar 26, 2017 · High Performance Regenerative Receiver - Schematic Diagram & Parts LayoutDesigned by Charles Kitchen, N1TEVhttp://www. I don't know enough about radio to judge the Step 12: Breadboarding: Building the Circuit. The term 'autodyne' simply refers to Apr 25, 2023 · The KRC-2 seems to be an unusual regenerative receiver, in that it uses a 10. R2 controls the amount of positive feed-back (regeneration). Sep 13, 2009 · KR1S Medium Wave FET Regen. 0: 6V6, 6SN7: 78 Mar 31, 2024 · This part two of the video about improving a simple FET regenerative receiver ( or at least trying to ). ”. This is only a preview of the February 1994 issue of Silicon Chip. The receiver can tune from 3. Inductors L1 and L2 can be made by winding 20 SWG enamel copper wire over a 2. Mar 28, 2016 · 14 Replies. When you add an LF stage and a fine tuning to the simple receiver with only one fet, you will have a much better regenerative receiver. Tony Westbrook recently contacted me about a regenerative receiver kit he has designed and produced in the UK. The schematic is shown here: I obtain fairly good performance feeding the output to an old Radio Shack amplified speaker. A bouncing wire 1/16" from the chassis has MUCH more effect on frequency than a bouncing wire 1/2" from the chassis. This FM radio receiver circuit is very simple to build and is powered by just a single 1. They are simple detectors which may be used for cw or ssb when adjusted for oscillation or a-m phone when set just below point of oscillation. The single tuned circuit is made up of the paralleled sections of 3 gang tuning capacitor C8 and one of the switched inductors L3, L4, L5, or L6. This receiver uses superregeneration for high sensitivity and low parts count. We started with the classic N1TEV regenerative receiver schematic in order to modify it hoping for a smaller but slightly better version 100% made with transistors. Figure 1a: VLF-LF Receiver, Regenerative RF Section. circuit's stability for CW and SSB reception. They excel at receiving amplitude modulated signals from below the AM broadcast band up to the higher short-wave bands above which the superregenerative detector becomes the better choice. Because the current usage is just a couple of milliamperes, the battery must go on for many months when the unit is used normally. The principle of operation is simple. Build this simple receiver and “bridge” the gap between regenerative and direct-conversion receivers! Despite the well-known draw- backs of regenerative receiv- ers, the elegance and simplicity of the regenerative detector is still appeal- ing. Note that the radio is transformerless and the tube filaments derive their power from 120V mains while in series with a 15uF 250V nonpolarized capacitor. It was called the Doerle Twinplex because it used the brand new 19 vacuum tube which contained two triodes in one glass envelope. Notice in the pictures that the wiring in the Regen section is with large solid wire for rigidity. Jan 30, 2017 · The basic schematic is: I started with a ferrite rod that I had from an old broken AM receiver. 3. com/watch Jan 13, 2015 · Fido is shown here assisting with the construction of this simple one-tube radio from the January 1947 issue of Popular Mechanics . I shall be using conductances rather than resistances as it simplifies the maths and the final analysis. D1 and C4 comprise a floating detector that pro- A Simple Regenerative VLF-LF Receiver. 5 to 12. org/files/file/Technology/tis/info/pdf Jan 24, 2016 · The regenerative receiver was popular in the early days of radio because it could deliver so much performance out of a simple circuit. After identifying the chassis as a complete regenerative receiver, I decided to see what it was capable of doing. I'd like to build an audio amplifier based on an LM386 op amp as part of the circuit, such as is shown in the same article Sep 13, 2022 · The regenerative receiver or regen radio provides a significant increase in gain and selectivity over the standard tuned radio frequency receiver. 2 by John Clarke. The regeneration setting on the KRC-2 is unaffected by the receiver tuning or the antenna Jul 3, 2009 · Regenerative Receiver Theory. Regenerative receivers ("regens") are a simple way to achieve high gain and reasonable selectivity in a single stage. Simple regenerative receivers electrically couple the antenna to the detector tuned circuit, resulting in the electrical characteristics of the antenna influencing the resonant frequency of the detector tuned circuit. Fun with Regenerative Receivers. The tuning range is 550-1200 kHz, meaning that the top part of the AM broadcast band is cut off. Building a simple 3-transistor regenerative receiver for HF shortwave. January 19, 2017. FIGURE 2. The single tube, in addition to serving as the detector, had some of its output fed back into the tube to amplify. Some people prefer the simple LM386 audio amplifier, others may chose a transistors based audio amplifier. The main modification is the use of the LM386 audio amplifier IC to give it a little better volume control, the use of 2N2222A transistors (instead of tubes), and the diodes that go to ground to How to Build the Twinplex Regenerative Receiver-SHIPPING INCLUDED! $10. These pieces are, respectively, the base, front, and rear assemblies of the chassis. The largewire diameter is important. One transistor version is here. 5V DC. It is G2 tuned feedback oscillator Nov 19, 2015 · The circuit itself is a very straightforward regenerative receiver covering the broadcast band. It can receive both FM and AM modulated signals. htmlThis is a modified version. Please note that this kit requires electronic assembly and soldering. org/files/file/Technology/tis/info An Ultra-Simple Receiver For 6 Meters by N1TEV This is a super regenerative receiver. That signal is then amplified by a triode or other device. Jul 25, 2011 · A Real Craftsman Builds a Regen Receiver. The receiver can be connected to a discone or other 75 Ω antenna via coax cable, or you can use TV twinlead cable to make a folded-dipole antenna. 8metre square frame (referfigure 4). The regenerative detector uses a field effect transistor (FET). The Regen section wires are routed away from the chassis and other metal as best can do, to lessen capacitive effects (IMPORTANT). By Charles Kitchin, N1TEV. July 25, 2011 By Dan KB6NU 1 Comment. Oct 7, 2015 · I recommend a Loop aerial of 20 turns of at least 1mm diameter wire spaced 1cm apart on a 0. Future issues of the magazine would carry improvements, and most parts Feb 15, 2017 · High Performance Regenerative Receiver - Ham Radio Homebrew Projects. The NEOPHYTE uses the pentode section as the regenerative detector and the triode for the audio. High quality AM through your FM stereo. Converting an AM broadcast receiver to hear 160 metres. The filaments are wired in series and the whole lot is run from a 12 volt gel battery. No high voltage required. Most parts are mounted on a printed circuit board that you get to make yourself. 5 MHz and uses a variable capacitor, coil, resistors, capacitors, FET, battery and regeneration control to receive AM radio broadcasts and SSB transmissions. ar ma gi lx ji gk er hu mp ei