This broadband amplifier was found in an Elektor from the 90's. The gain is 10 dB with a noise figure of less than 5 dB.
In this circuit we show how to modulate the pulses produced by a 555 in frequency. The circuit can be...
This toy organ was found in Popular Electronics from January 1967. It can be constructed from...
This elaborate electric fence design differs from the others by triggering an alarm in the event of...