This circuit doubles the frequency of signals from 10 to 50 MHz. We found it in a 1969 Electronic Design. The components are from the period.
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...