Using red LEDs with ignition voltages of the order of 1.5 V we can make a multiple voltage reference. Current is low.
This circuit for receiving or transmitting low power was found in old American documentation. It is...
Suggested by the 90s ARRL Handbook edition, this circuit aims to reduce or cancel noise at the...
This circuit allows you to read capacitances on a common analog instrument. It is part of an...