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TL431 Crystal Radio Amplifier - Here is a simple audio amplifier using a TL431
shunt regulator. The amplifier will provide room-filling volume from an ordinary
crystal radio outfitted with a long-wire antenna and good ground. The circuitry is
similar in complexity to a simple one-transistor radio but the performance is far
superior. The TL431….(added 04/05/06)
Ultra low frequency receiver - The frequency covered is from 0.1Hz to 10Hz and
useful signals are received up to 16Hz. The first Op-Amp, properly shielded, must be
installed close…. (added 9/07)
Very High Gain Crystal Earphone Amplifier - This simple, one-transistor amplifier
provides a voltage gain over 1000 (60 dB) for driving a high impedance ceramic
(crystal) earphone. The high gain is achieved by replacing the traditional collector
resistor ….(added 04/05/06)
ZN414 Portable AM Receiver - An AM portable radio receiver made from the ZN414 IC.
The ZN414 ic has now been replaced by the MK484 which is identical in performance and
pinout. (added 10/05)
