Found in Unitrode documentation, this oscillator uses some unusual components today such as PU and the 3 M potentiometer. The power can be made with voltages around 15 V.
Some old record players use variable reluctance phono pickups, requiring a special amplifier...
The circuit shown is from a 1994 National Semiconductor technical documentation. The circuit can...
We found this circuit in an American publication from 1966. The transistor fires when it detects a...