This circuit generates pulses whose frequency depends on C1. The circuit can be powered by voltages from 5 to 15 V. We find this configuration in a Signetics manual.
This circuit with RIAA equalization is from 1985 US documentation. The circuit has a flat response...
Found in Popular Electronics from the 1980s, this circuit can use more modern transistors such as...
This circuit appears in other articles in this section, but it is very interesting. It is a...