This precision bench test circuit can deliver currents in a range of 10 uA to 10 mA. The circuit is from an 80's documentation. The components are from the time.
We found this circuit in an 80's Radio Electronics. The circuit uses a PTC sensor and an LED...
In this circuit a 12 V lamp or LED blinks with the music signal applied to the input. R depends on...
Using a period sensor, this circuit was found in the February 1986 issue of Radio Electronics...