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Microcontrollers - list of circuit diagrams

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Electronic Doorbell with Counter circuit diagram
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: 6165
DC Motor Reversing Circuit circuit diagram
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: 5808
Water Activated Relay circuit diagram
Simple Water Activated Relay Circuit

author: Marin Lukas
visits: 5644
Remote Doorbell Warning Switch circuit diagram
This circuit will light a lamp at a remote location when the doorbell switch is pressed

author: Andy Collinson
visits: 5514
Triac Based Light Controller circuit diagram
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: 5414
Electronic Night Light circuit diagram
Very simple Electronic Night Light circuit

visits: 5078
PBS Switch Debouncing Circuit circuit diagram
This circuit will remove the transient spikes and contact bounces from a non-latching push button switch

author: Andy Collinson
visits: 5008
Sound Operated Switch circuit diagram
This sensitive sound operated switch can be used with a dynamic microphone insert as above, or be used with an electret (ECM) microphone

visits: 4754
Digital Combination Lock circuit diagram
Simple Digital Combination Lock Circuit

visits: 4689
Voltage Comparator Switch circuit diagram
This circuit will provide an indication whenever the input voltage differs from two defined limits

visits: 4451
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