![]() ![]() View attachment 72255 View attachment 72256Īnd here are some assorted JetKing print ads from old publications. The HX-108 is a great kit also, but I would love to build a multiband SW MW kit like the JetKing. Here is a schematic of a JetKing 3-band kit from the excellent book "Basic Radio and Television" by S.P. There is something beautiful about the simplicity of old-fashioned AM receivers that future generations of electronics tinkerers will miss out on. I have been experimenting with AM transmitter circuits but unfortunately the results have not been great so far. Sad if true, for all the vintage radio fans. ![]() Maybe there is a slight chance that they have one kit remaining still. Do you have the contact details for OM Electronics. You must be owning one of the last kits made. Great memories.ītw, this edition of Electronics Projects Vol-1 also featured a 3-band (MW/SW1/SW2) radio circuit built around the BEL 700 IC. This MW transmitter worked so well when I built it, we wired it to an outdoor aerial and used to walk around our immediate neighbourbood trying to ascertain how far the signal would reach. If anyone has this circuit from this early EFY digest, please share it (my copy is long lost unfortunately). The purpose was to add a phono input feature for playing records through tube radios which did not have a phono (or gram) input and transistor radios. ![]() It had a single transistor MW transmitter circuit built around a AC125 transistor by Sandeep Bagchi, in the circuit ideas section. On the topic of AM transmitter, when I was in 6th standard (1983) i received a digest called Electronics Projects Vol-1 (published by Electronics For You). There are quite a few asking for old tube radio and transistor radio circuits. Unfortunately both these are lost but if anyone either has these or comes across these with local sellers of old books, please do pick these up and we can digitize these and make the e-version available to our forum members. It had the circuits of almost all the radios (tube and solid state) available in India at the time. I had a couple of book called Radio Circuits Vol-1 and Vol-2 (had a grey colour cover and was rectangular in shape) published by the Business Promotion Bureau, New Delhi in the 1970s. I am assuming that your "speaker" is a crystal earpiece and if so, the 0.1 uF output coupling capacitor is not necessary and would be best if left out.Ĭolpitts Regen 3TRANSISTOR_schem.What a lovely thread, brings back so many memories. It would be best to connect the cold end of the tuning capacitor to ground as shown to minimize hand capacitance effects. If you are using general purpose transistors, the two capacitors in red may not be necessary because the intrinsic input capacitances of the general purpose transistors may be sufficient. Rotating the potentiometer so that there is a higher voltage on its wiper will inhibit the oscillation. Using a 500 pF variable capacitor will tune from about 3 MHz to 10 MHz.īy adding 2 capacitors (22 pF and 100 pF) shown in red along with the 1nF cap from the Collector to ground, the circuit becomes a Colpitts oscillator and the regeneration controlled by the 10K regen potentiometer. Your original schematic with a few modifications may be turned into a spectacular performing regenerative receiver which requires no external antenna and by changing the input inductor to a ferrite rod with 10 turns may be converted to a shortwave receiver which can receive stations from around the world. ![]()
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