This sequential beacon was found in an 80's Radio Electronics. The circuit can be designed using modern equivalent components. Triacs shall be fitted with heat sinks.
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...