This circuit triggers a relay when the set temperature is reached. The circuit is from an old documentation. The relay may be equivalent according to the transformer secondary voltage.
This non-inverting AC amplifier was found on a Popular Electronics. The setting applies to any...
This small inverter came out in an Argentine magazine from the 1970s. It can also be assembled with...
The figure shows how to use a CMOS amplifier as a crystal-controlled oscillator. The circuit is...