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Microcontrollers - list of circuit diagrams
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This circuit uses a synthesized sound chip from Holtek, the HT-2811. This reproduces the sound of a "ding-dong" chiming doorbell. Additionally, the circuit includes a CMOS 4026 counter display driver IC to count your visitors.
author: Andy Collinson visits: 573 
This project is intended for controlling mains powered disco lighting, although there are many other possible uses for controlling almost any mains appliance
author: Matthew Hewson visits: 553 
A DC motor reversing circuit using non latching push button switches. Relays control forward, stop and reverse action, and the motor cannot be switched from forward to reverse unless the stop switch is pressed first.
author: Andy Collinson visits: 537 
This circuit will light a lamp at a remote location when the doorbell switch is pressed
author: Andy Collinson visits: 515 
This sensitive sound operated switch can be used with a dynamic microphone insert as above,
or be used with an electret (ECM) microphone
author: visits: 496 
This circuit will remove the transient spikes and contact bounces from a non-latching push button switch
author: Andy Collinson visits: 473 
This circuit will provide an indication whenever the input voltage differs from two defined limits
author: visits: 451
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