This circuit reproduces the dial noise in a small speaker. The transistor can be a general-purpose type. We found it in an 80's Electronic Design.
This small audio amplifier uses germanium transistors and a 12 V supply. The circuit is from a...
Found in the March 1989 issue of Radio Electronics magazine, this circuit is used to test printer and...
This circuit can drive a white LED from a 3 V supply. The circuit is intended to supply White LEDs...