In the figure we have a simple thermometer with NTC, using an analog current indicator. The adjustment is made in the trimpot and the power is done by batteries.
In the figure we have an interface using an optical coupler and the comparator LM339 or any...
Using 18 or 24 MHz crystals, this circuit is intended for producing reference signals with...
We found this amplifier in a publication of 1990, but it can be mounted today with some exchanged...