We found this circuit in a 1987 documentation. It is a multi-tester with neon lamp and LEDs operating with both low continuous voltage and high alternating voltage.
This modulated transmitter for a light beam communication system was found in the 1991 Electronics...
This phase-shift oscillator with a transistor generates sinusoidal signals in the audio range. The...
This signal amplifier for ATV in the 427 to 439 MHz band was found in a magazine 73 for radio...