We found this precision circuit in a manual from the 80's. The operational amplifier is of a common type at the time, and equivalents can be tested. Transistors are general purpose types.
The inverter circuit shown in the figure provides a voltage of around 110 V with a rectangular waveform...
This lockable two-position servo control system was found in documentation from the 1990s. The...
For the 600 kHz range coil is formed by 35 turns of 28 AWG wire on a ferrite core with a diameter...