The figure shows how to drive a load up to 300 mA with an LM3900. The transistor can be a BD136. We found this setting in the 1994 National Semiconductor Linear Applications Handbook.
This basic oscillator with tunnel diode generates a 100 kHz signal with 1 uW output power. The...
This preamplifier for high impedance microphone is designed to make a good addition to the speaked word...
Microphones and other signal sources can be connected at the input of this circuit, with the 4.7...