Newest circuit diagrams
This circuit will light a lamp at a remote location when the doorbell switch is pressed. This circuit should only be used with the solenoid type doorbells, the electronic type that play tunes will not work here.
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A very basic square wave generator using a CMOS 4011 NAND gate.
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A switched timer for intervals of 5 to 30 minutes incremented in 5 minute steps.
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This is a simple single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays and a timed Bell/Siren Cut-Off. 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. But it can be Easily Modified to accept normally-open triggering devices - such as pressure mats.
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Remote sensor sends data via mains supply
Temperature range: 00.0 to 99.9 °C
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Minimum parts counting - Improved version. 3V battery operation
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This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324. It is a popular IC and should be available from many parts stores.
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An low power FM Transmitter using an op-amp as the audio preamp and a single transistor as the RF amplifier.
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A solar battery charger that uses a shunt regulator to prevent overcharging. Circuit uses a 12V solar battery, but can be adapted for other voltages.
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This is an Analogue TV Transmitter. Sound modulation is type FM with a 5.5MHz carrier and video transmission is PAL. Frequency is adjustable via C5 and tunes 54 to 216Mhz with components shown. This is suitable for countries using TV systems B and G.
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