This circuit is from an 80's Radio Electronics. The circuit has several output options for 50 mA currents with load indicator through LEDs.
This circuit was found in an English publication of 1982. The operational can be replaced by an...
This circuit is based on the voltage reference that is uncommon today MC1403. Equivalents can be...
This humidity alarm, rain or leakage was found in a 1992 publication. The sensor consists of a printed...