This circuit controls 6 LEDs in two sets with the phase change cycles controlled by a 555 oscillator. The circuit can be powered by voltages between 6 and 12 V.
This common gate circuit for the 13 to 30 MHz band was found in old English documentation....
This circuit was originally found in a Philips documentation from 1969. It is intended for sensing...
This FET voltmeter is from an old 1974 amateur radio publication. The circuit can use MPF102 or...