B21126E)
This circuit was taken from an old Popular Electronics. The circuit can have its frequency changed from an external signal. The center frequency is given by C1.
March 2017 – Mouser Electronics already has the new Texas Instruments INA260 digital current and...
We found this circuit in the 1960 Mullard transistor reference manual. The phototransistor can be a...
The integrated circuit used in this 1982 project is not very common today. It can be adapted to...