Found in old documentation, this oscillator operates with high voltage. The diode must be of the appropriate type with low current and an inverse voltage of at least 100 V.
This circuit is from Popular Electronics from the 90s. The integrated circuit is not very common...
This direct-coupled amplifier was found in Mullard's 1960s transistor manual. The transistors are...
The LM148 and its counterparts are part of a family of low consumption quadruple operators...