This circuit of a Popular Electronics from the 90s makes use of components of the time. The circuit has sampling and retention capabilities and a conversion rate of 1V / kHz.
Found in the April 1995 issue of Electronics Now, this circuit operates at a lower frequency than...
This circuit was found in an 80s Hands On Electronics. It senses the water level in a reservoir by...
This amplification stage circuit with a germanium transistor was found in a 1980s documentation. The...