This circuit was found in a 1980s English documentation. It is intended for old xenon lamp flashes. However, the circuit can be adapted for other applications.
We can implement this filter with more modern equivalent operational amplifiers, since the LM110 is...
This stethoscope or amplifier for hearing aid using a crystal headset and microphone was found in a...
The normal use of a 4520 as a divide-by-16 counter is shown in Figure bellow. In the normal...