This circuit was found in the 1967 RCA SCR manual. The circuit generates approximately 300 V at a frequency of 1 kHz. The components are from the era.
We found this good power amplifier with the LM12 integrated circuit in the March 1989 issue of...
This simple circuit produces a tone when triggered by any vibration picked up by the sensor. The...
This circuit was published in an English magazine from 1980. The magazine no longer exists, but...