Found in an Electronic Design from 1968 this circuit generates a linear sawtooth signal modulated by an input signal. The transistors are from the era.
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...