Found in a 1990s American technical brochure, this circuit is intended for alarms that use as photodiode sensors. The circuit has a frequency response of up to 20 kHz. The gain is 40 dB.
This power supply provides a12 V stabilized output. The transistor must be provided with a good...
Found in a 1967 Electronics World, this circuit can use any modern equivalent FET. Observe the...
XTAL from 4 to 20 MHz can be used in this oscillator. The XRF choke can range from 10 to 100 µH...