This circuit can be used as an amplifier for musical instruments or even with your cell phone. The circuit is old and was found in the 1990 edition of Radio Electronics Experimenter magazine.
This circuit activates a relay that has a lamp as a load. The circuit is from a Radio Electronics from...
This circuit was found in an English publication from1979. The circuit can be assembled with a...
An oscillator whose frequency can be adjusted between 500 Hz and 5 kHz with the use of a...