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Home > Circuits
CIRCUIT DESIGNS

Modified:14:20, 22 March 2016

Most of these circuits I have designed and tested. Some are copies of circuits demonstrating a neat or clever way of functioning. I don't take any responsibility for anyone using them and feel free to adjust or modify them as you wish.

Some PDF's have PCB's generated for the circuit ready for construction.
Do check the scale of the drawing after you have printed it out.

Designs are available as GIFs and PDF's.
To open the simulations you will need
Crocodile Clips v3 or 4 or LiveWire.

This page is currently being updated. Bold links in capitals lead to new pages for faster viewing of circuits. All circuits will be completed as time allows.

On this page...

FORMATS:
= CrocClips,
= GIF
= MGX Draw file.
= PDF
= Livewire
= PCB Wizard


AUDIO

GAMES

HOBBY STUFF

COUNTERS & TIMERS
  • 1-90 Bingo Number Generator
    A neat little counter counting from 1 to 90 (not zero) with the aid of a few gates - -
  • 24 Hour Clock 2
    An example of using gates to "trap" binary values on counters with positive edge clocks - -
  • 24 HOUR TIMER
    A timer that will switch on for 12/24 hours - once only or repeat - can be modified for up to 2 weeks!
  • Boxing Timer - NEW
    A student needed a timer that counted down one minute. This does exactly that - -
  • Digital Stopwatch
    Times up to an hour in tenths of a second - -
  • DUAL 7-SEGMENT SCOREBOARD
    A dual display that has controls to count up, down and reset. Runs from 5-12volts - -
  • Door Monitor
    Counts the number of times a door is opened. Counts up to 9 but can be easily expanded - -
  • EGG TIMER
    Two 555 timers, a buzzer sounds at the end of the time period, one beeps, the other bleeps! -
  • FISH FEEDER - NEW
    An interval timer that can pulse a feeder on for 10-22 seconds every 1,2 or 4 hours
  • Large 7-segment Display board
    A resizeable display from 40mm to 150mm! - -
  • Room Sentry
    Counts the number of people entering a room, for use with a PIR module - -
  • Scalectrix Lap Timer
    Works by using an LDR under the track, times alternate laps in 10ths of a second - -
  • Single Digit Scoreboard
    A compact general purpose display. - -
  • VERSATILE TIMER IC
    An 8-pin PIC generating hourly/daily pulses, saves lots of circuitry - example circuits also

MEASUREMENT & TEST STUFF
  • 1.5v Battery meter
    Simple but effective way of testing 1.5 volt cells - -
  • 12 Volt Car Battery Meter
    A 10 LED calibrated voltmeter from 11-15 volts, needs no extra battery - -
  • Audio VU Meter
    A VU meter with 20 LED's. The input source can be a line input or a microphone - -
  • FREQUENCY TO VOLTAGE CONVERSION
    Using the LM2917 for a few useful applications -
  • LED Battery Meter
    Will measure any low voltage battery on a 10 LED scale! -
    -
  • LED Strobe
    With high power LED's available, their replacement for a Xenon tube is viable! -
    -
  • LED STROBE 2 - NEW
    This version has been built and tested and is very simple indeed - based on Alien project astable!
  • REV COUNTER
    A 10-LED Rev Counter/Tachometer using the LM2917. Also a general purpose frequency-voltage circuit
  • SERVO TESTER - NEW
    A simple circuit based around one logic IC which will test/control most radio-control type servos
  • TRIANGLE WAVE AUDIO ASTABLE - NEW
    A useful replacement for a sine wave generator, has AC/DC output and square and triangle outputs


MISCELLANEOUS
  • 12v LIGHT DIMMER v2
    This version controls lights, LEDs and even motors with only 10 components - up to 50W!
  • AUTOMATIC BILGE PUMP SENSOR - NEW
    This simple circuit will keep your engine bay under control and draws no current while in standby
  • Dog Warden
    A simple radio transmitter and reciever to signal when a dog has strayed too far - -
  • INVERTER
    Generates a negative supply in a battery circuit for split power supply circuits.
  • KEYPAD DECODER - NEW
    Decodes and generates a standard 4x3 keypad to produce a 4-bit binary output.
  • Night Rider 2
    This version has been built and tested - includes drive circuitry and PCB
  • Knight Rider
    An adaption of the Light Bouncer makes a classic light chaser - -
  • Light Bouncer
    A a simple chaser from a decade counter - bounces a light on 6 bulbs - -
  • Remote Control Beeper
    Uses RF Tx/Rx modules with a range of about 30m
    . - -
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