This electronic circuit is a fm transmitter circuit that suitable for beginners for stereo encoder testing. Provided the input stage is designed to accommodate line input levels i.e. approx. 2Vrms into 50kOhm. The transmitter output power is approx. 80mW, which is sufficient to cover an area of about one hundred meters.
The RF portion consists of [...]
A simple passive (no power required) circuit to match an antenna to a radio receiver. This will be a useful addition to the short wave listener, but in addition a medium wave coil is almost used to tune the medium wave band. [....]
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Figure 1: AM radio input circuitry before the modification
This page is based on the article: “AM Radio Booster” by Gary McClellan, Radio Electronics, April 1972, page 25.
Figure 1 shows the antenna input circuitry of a typical AM radio. There may be some slight variations on this, but the circuit described here will compensate for them.
The [...]
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