I will add more here when I get back to it. Now if I only knew how to use the software to make circuit boards. ![]() The other chip on the little board is a noise blanker that I don't feel like trying to build the filter network for it.Īfter about a whole day of messing with it. The 8volt regulator is at the top and the two transistors at the bottom right are to switch on the stereo lamp.(not LED) The pot at the right is for tuning the VCO. So at that point I gave up on the original IC. Both the 19k signals were present at the two filter and trap. This is followed by the first IF transformer. There is a single RF amp 3sk40 followed by a balanced mixer consisting of two 3sk40. 'Circuit description: The tuning capacitor has 5 gangs for FM, 4 for RF and one for OSC. If any of you old/new timers have some information where to look for that kind of magazine articles please tell me. Internally there are two main sections, the RF/IF/detector board and the power supply/MPX/audio board. I was looking for some article in old electronics magazines but until now without any luck. The circuit relies upon the IC BA1404 from ROHM Semiconductors. I ordered three different ones and got lucky that at least one of them is actually what it was advertised as.Īnd here is the block diagram. I want to build stereo MPX decoder (adapter) for my Fisher FM-100 tuner. An exceptional stereo audio FM wireless transmitter circuit is presented below. I ordered what is suppose to be a MPX decoder for a car radio. And finally came to the conclusion that the IC was bad. The 1,000-Hz sine wave is then applied to the TCG-610 varactor diode, 6 pF at 4 V, which changes the tank capacitance, thus varying the rf. I been trying to fix the original stereo decoder in this Sony STR7065. A-one-transistor-fm-transmitter The 2N2222 circuitry is a three-element, phase-shift oscillator circuit, designed to yield a 1,000-Hz sine wave.
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