This common transistor-based circuit provides power for 20 mA common white LEDs from a single 1.5 V battery.
The presented circuit uses a window comparator to keep a relay activated only when the sensor is...
This circuit with the CK722 has a small range. We found it in Radio Electronics magazine from...
This is the minimum amplifier configuration with the LM380 and can provide an output of up to 2.5...