Through the TTL output this circuit can be used as a shield. The sensor is a platinum probe, and the operational amplifier can be replaced by a modern equivalent, preferably of low voltage.
The supplied circuit allows direct control of a small DC motor up to 250 mA. The basic component used...
This frequency band below 15 kHz converter was found in a Popular Electronics from the 90's. The...
If you have a common analog multimeter, you can increase its input resistance in the measurement of...