This circuit was found in old documentation. Operational amplifiers can be almost any type. Design formulas are given next to the diagram.
We found this project in a 1982 publication. What we have here is an audio signal relay trigger, which...
This power supply was originally designed to power the amplifier shown in CB16743E, but it can be...
This circuit generates signals for adjustments in FIs of 10.7 MHz. The transistors can be BC548 or...