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The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom. Usually a single telephone i... -
Strip LEDs are available in different colours powered by direct current (DC) source. These LEDs are available as surface mount devices with... -
A novel supply voltage monitor which uses a LED to show the status of a power supply. This simple and slightly odd circuit can clearly sho... -
This circuit is intended to signal, through a flashing LED, the exceeding of a fixed threshold in room noise, chosen from three fixed leve... -
Circuit of an automatic switch for audio power amplifier stage is presented here. The circuit uses stereo preamplifier output to detect...
