Newest circuit diagrams
This is a circuit to control motor speed uses pulse width modulation (PWM). The PWM signal is generated by the ubiquitous 555 timer and output current amplified by a power transistor.
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In this circuit a non-locking push switch is used to activate a load. The load remains switched on until power is removed from the circuit.
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This is a simple single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays. It's designed to be used with the usual types of normally-closed input devices such as - magnetic-reed contacts - micro switches - foil tape - and PIRs.
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A novel supply voltage monitor which uses a LED to show the status of a power supply.
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A variable notch filter with both high and low pass filters.
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High sensitivity, portable temperature comparator Detects draughts around doors, windows, etc.
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This circuit was designed primarily for the situation where a hijacker forces the driver from the vehicle. If a door is opened while the ignition is switched on - the circuit will trip. After a few minutes delay - when the thief is at a safe distance - the Siren will sound.
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Tests transistors and diodes for polarity. Simple circuitry - 9V Battery operation
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A basic regulated 12 Volt power supply
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Three circuit options. Can be synchronized to Christmas tree flashing lights
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