This 300 Hz to 3.4 kHz filter was found in the May 1989 Radio Electronics magazine. The circuit requires a symmetrical power supply.
This Wheatstone bridge has a thermistor or NTC sensor, allowing the measurement of temperatures by...
This headphone amplifier was found in a 1966 documentation. The transistor is made of germanium and the...
This circuit came out in a publication called Electronics Handbook of 1993. Q1 can be a 2N2222 or even...