Found in a Popular Electronics from the 90s, this shield is activated by a 20 mA current. The inverter is an Open Collector TTL type. The power is 5 V.
We found this filter in the 1990 Motorola Linear Databook, but it can be implemented with other...
Instead of the lamps, LEDs can be used in series with 470 ohm resistors. The circuit is from an...
This low current solenoid driver was found in an ancient American documentation. The solenoid must be...