This well-designed bistable configuration is for educational purposes. We found it in the September 19873 Radio Electronics magazine. The transistors are types from that time.
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...