Motorcycle Low Voltage Warning

http://www.uoguelph.ca/%7Eantoon/circ/mlvw.html

Pulse Timer, 555

http://www.uoguelph.ca/%7Eantoon/circ/pulsetimer.html

Auto-Fan, temperature control

http://www.uoguelph.ca/%7Eantoon/circ/auto-fan.html

Red Alert Alarm, #2

http://www.uoguelph.ca/%7Eantoon/circ/RedAlert2.html

Battery (NiCad) Rejuvenator

http://www.uoguelph.ca/%7Eantoon/gadgets/rejuv.html

Relays - Long Duration--1 min to 20 hrs

http://www.uoguelph.ca/%7Eantoon/circ/relay11.html

Bug Detector with Beep

http://www.uoguelph.ca/%7Eantoon/circ/bugbeep.htm

Compressor-Mate

http://www.uoguelph.ca/%7Eantoon/circ/compm8/compmate.html

Countersurveillance Monitor

http://www.uoguelph.ca/%7Eantoon/circ/BugDetec/BugDetec.html

A simple solar panel regulator

http://ludens.cl/Electron/solar2/solar2.html

Servo Modification

http://www.uoguelph.ca/%7Eantoon/gadgets/servos/servomod.html

Crystal Tester, #3
http://www.uoguelph.ca/%7Eantoon/circ/xtaltst3.html

Power Amplifier OTL 30W by IC TDA2030 +Transistor

http://www.elecfree.com/electronic/30w-amp-otl-by-tda2030-transistor/

Warble Alarm

http://www.uoguelph.ca/%7Eantoon/circ/Warble.html

Pulse Width modulator, 4093

http://www.uoguelph.ca/%7Eantoon/circ/pwm14093.html

Basic LM3909 Led Flasher

http://www.uoguelph.ca/%7Eantoon/circ/ledflash.htm

Bench Top Power Supply, Part 4

http://www.uoguelph.ca/%7Eantoon/circ/ps3010/ps3010d.html

Two-Tone Trainhorn

http://www.uoguelph.ca/%7Eantoon/gadgets/trnhorn.htm

30-Meter QRP Transmitter for Morse Code

http://www.uoguelph.ca/%7Eantoon/circ/30m.htm

Programmable Function Generator
by 4066 and 4017

http://www.elecfree.com/circuit/digital-circuit/programmable-function-generator-by-4066-and-4017/

Relays - Self Latching

http://www.uoguelph.ca/%7Eantoon/circ/relay8.html

Bench Top Power Supply, Auto-Fan
http://www.uoguelph.ca/%7Eantoon/circ/auto-fan.html

Coin Tosser

http://www.uoguelph.ca/%7Eantoon/circ/cointoss.html

Theremin

http://www.uoguelph.ca/%7Eantoon/circ/theremin.html

Cut Phone Line Detector

http://www.uoguelph.ca/%7Eantoon/circ/cpld.htm

Fluid-Level Detector

http://www.uoguelph.ca/%7Eantoon/circ/sensor3.htm

Logic Probe(1), with pulse, TTL/CMOS

http://www.uoguelph.ca/%7Eantoon/circ/probe1.htm

Regulator 12V 10A by IC 723+2N3055

http://www.elecfree.com/circuit/power-supply/regulator-12v-10a-by-ic-7232n3055/

5 Transister (C945) tone control mono.

http://www.elecfree.com/circuit/tone-control/tone-control-mono-by-5-transister-c945/

Birdie Doorbell Ringer
http://www.uoguelph.ca/%7Eantoon/circ/birdie.htm

Morse Code Practice Keyer, I

http://www.uoguelph.ca/%7Eantoon/circ/morse1.htm

Automatic 9-Volt NiCad

http://www.uoguelph.ca/%7Eantoon/circ/nicd.htm

Battery Tester for 1.5 & 9V

http://www.uoguelph.ca/%7Eantoon/circ/battest.html

RF Transmitter, light sensing

http://www.uoguelph.ca/%7Eantoon/circ/rftls.htm

Broadcast-Band RF Amplifier
http://www.uoguelph.ca/%7Eantoon/circ/broadcast.html

Third Brake Light Pulser

http://www.uoguelph.ca/%7Eantoon/circ/flashing.htm

DC Motor Reversing Circuit
http://www.mitedu.freeserve.co.uk/Circuits/Switching/reverse.htm

Phase Shift Oscillator by IC 4049

http://www.elecfree.com/circuit/Oscillator-Generator/ic-4049-phase-shift-oscillator/

Audio Pre-Amplifier #1

http://www.uoguelph.ca/%7Eantoon/circ/preamp.htm

Bench Top Power Supply, Part 1

http://www.uoguelph.ca/%7Eantoon/circ/ps3010/ps3010a.html

Amperage Booster for 78xx's

http://www.uoguelph.ca/%7Eantoon/circ/ampboost.html

LED Voltmeter for car battery by LM324

http://www.elecfree.com/circuit/car-automotive/led-voltmeter-for-car-battery-by-lm324/

Micro-Spy with TTL

http://www.uoguelph.ca/%7Eantoon/circ/uspy3.htm

Lead Acid Battery Charger

http://www.uoguelph.ca/%7Eantoon/gadgets/labc.htm

555 Go No/Go Tester

http://www.uoguelph.ca/%7Eantoon/circ/555test2.htm

12V to 9V with a LM317

http://www.uoguelph.ca/%7Eantoon/circ/ps-lm317.html

Gel Cell Charger, II

http://www.uoguelph.ca/%7Eantoon/circ/bcgla2.htm

Morse Code Practice Keyer, II

http://www.uoguelph.ca/%7Eantoon/circ/morse2.htm

Motorcycle Turn-signal System

http://www.uoguelph.ca/%7Eantoon/circ/motturn.html

AT-121 (3W) to AT-150 (2W) Converter
http://www.uoguelph.ca/%7Eantoon/circ/at121.html

Alternating On-Off Switch, #1

http://www.uoguelph.ca/%7Eantoon/circ/alt1.htm

35W Amplifier BCL by TDA2030

http://www.elecfree.com/circuit/power-amplifier/35w-amplifier-bcl-by-tda2030/

Power Amplifier BCL 35W by TDA2030

http://www.elecfree.com/electronic/35w-amplifier-bcl-by-tda2030/

Simple Regulator By Transistor (C1061)

http://www.elecfree.com/circuit/power-supply/simple-regulator-by-transistor-c1061/

Water Activated Alarm by IC 555
http://www.elecfree.com/circuit/digital-circuit/water-activated-alarm-by-ic-555/

Micro-Spy with USW
http://www.uoguelph.ca/%7Eantoon/circ/uspy2.htm

Hot Wire Foam Cutter, 4

http://www.hhhh.org/%7Ejoeboy/resources/hotwire_foam_cutter/hotwire_foam_cutter.html

4 Transistor Transmitter

http://www.uoguelph.ca/%7Eantoon/circ/fmt5.html

Gadgets for Radio Control Page
http://www.uoguelph.ca/%7Eantoon/gadgets/gadgets.htm

Variable Power Supply, 1 - 30V @ 1.5A

http://www.uoguelph.ca/%7Eantoon/circ/VarReg1/VarReg1.html

Active FM Antenna Amplifier

http://www.uoguelph.ca/%7Eantoon/circ/activefm.html

Radio Shack Special

http://braincambre500.freeservers.com/

Video Amplifier by transistor BC547 & BC557

http://www.elecfree.com/circuit/power-amplifier/video-amplifier-by-transistor-bc547-bc557/

Lead Acid Charger (Gel Cell)
http://www.uoguelph.ca/%7Eantoon/circ/bcgla.htm

Water-level Sensing and Control
http://www.uoguelph.ca/%7Eantoon/circ/sensor1.htm

Continuity Tester, Low-Voltage

http://www.uoguelph.ca/%7Eantoon/circ/cntnuity.htm

Relays - Automatic Turn-off

http://www.uoguelph.ca/%7Eantoon/circ/relay62.html

Basic IC MonoStable Multivibrator

http://www.uoguelph.ca/%7Eantoon/circ/monovib.htm

Treble Booster By 741

http://www.elecfree.com/circuit/tone-control/treble-booster-by-741/

One - Shot Timer by IC 555
http://www.elecfree.com/circuit/digital-circuit/one-shot-timer-by-ic-555/

Active Antenna for HF-VHF-UHF
http://www.uoguelph.ca/%7Eantoon/circ/AA7/activant2.html

Simple Adjustable Voltage Source

http://www.elecfree.com/Simple_Adjustable_Voltage_Source.php

Pulse Generator by IC 1458

http://www.elecfree.com/circuit/Oscillator-Generator/pulse-generator-by-ic-1458/

Miniature FM Transmitter #4

http://www.uoguelph.ca/%7Eantoon/circ/fmt4.html

Logic Probe(2), with pulse, TTL/CMOS

http://www.uoguelph.ca/%7Eantoon/circ/probe2.htm

Hot Wire Foam Cutter, 2

http://www.techlib.com/hobby/hotwire_foam_cutter.htm

4 Transistor Tracking Transmitter

http://www.uoguelph.ca/%7Eantoon/circ/txtrack.htm

Touch Switch using Transistors

http://www.uoguelph.ca/%7Eantoon/circ/touch1.html

Continuity Tester, Smart

http://www.uoguelph.ca/%7Eantoon/circ/cntnuit2.htm

Inverter 500W
12 Volt to 220 Volt(Transistor)
http://www.elecfree.com/12-volt-to-220-volt-inverter-500w.php

Active Power Zener

http://www.uoguelph.ca/%7Eantoon/circ/pwrzener.html

Inverter 100W
12V to 220V (Transistor)

http://www.elecfree.com/Inverter_12V_to_220V_100W-Transistor.php

High-Voltage Projects you can Build
http://www.uoguelph.ca/%7Eantoon/circ/hv/hv.html

Constant Current Charger

http://www.uoguelph.ca/%7Eantoon/gadgets/sccs.htm

Relays - Transistor Boosted

http://www.uoguelph.ca/%7Eantoon/circ/relay5.html

Regulator 0-30V 5A by IC 723 & 2N3055 -2part

http://www.elecfree.com/circuit/power-supply/supply-regulator-0-30v-5a-by-ic-723-2n3055-2part/

2 Transister (C945) tone control Stereo.
http://www.elecfree.com/circuit/tone-control/tone-control-stereo-by-2-transister-c945-2/

Super Small Amp 1.2W by IC TDA7052

http://www.elecfree.com/circuit/power-amplifier/super-small-amp-12w-by-ic-tda7052/

3 Transister (C945) tone control mono.

http://www.elecfree.com/circuit/tone-control/tone-control-mono-by-3-transister-c945/

Miniature FM Transmitter #6

http://www.uoguelph.ca/%7Eantoon/circ/fmt6.html

HA1377 Bridge Amplifier BCL cap 17W (with PCB)

http://www.elecfree.com/circuit/car-power-amp/ha1377-bridge-amplifier-bcl-cap-17w/

Regulator 0-30V 5A by IC 723 & 2N3055 -2part

http://www.elecfree.com/circuit/power-supply/supply-regulator-0-30v-5a-by-ic-723-2n3055-2part/

Function Generator by IC 1458

http://www.elecfree.com/circuit/Oscillator-Generator/function-generator-by-ic-1458/

Regulator 1.25-30V 1A By LM317T

http://www.elecfree.com/circuit/power-supply/supply-regulator-125-30v-1a-by-lm317/

Micro-Spy with FET's

http://www.uoguelph.ca/%7Eantoon/circ/uspy.htm

Leds Flasher, alternately
http://www.uoguelph.ca/%7Eantoon/circ/flash2.htm

Relays

http://www.sentex.ca/%7Emec1995/relay4s/relay4s.html

HotChek

http://www.cliftech.com/

Xmas Lights Tester

http://www.uoguelph.ca/%7Eantoon/circ/xmasbulb.html

Crystal Tester, #2
http://www.uoguelph.ca/%7Eantoon/circ/xtaltst2.html

TDA1904 Audio Amplifier OTL 4W
http://www.elecfree.com/circuit/car-power-amp/tda1904-audio-amplifier-otl-4w/

Regulator 12V 10A by IC 723+2N3055

http://www.elecfree.com/circuit/power-supply/regulator-12v-10a-by-ic-7232n3055/

Logic probe by IC 4050

http://www.elecfree.com/circuit/digital-circuit/logic-probe-by-ic4050/

Latching Continuity Tester

http://www.uoguelph.ca/%7Eantoon/circ/latching.html

1.5V Tracking Transmitter

http://www.uoguelph.ca/%7Eantoon/circ/tx15trak.htm

ScanMate

http://www.uoguelph.ca/%7Eantoon/circ/scanmate.htm

Relays - 12 Sec to 90 min

http://www.uoguelph.ca/%7Eantoon/circ/relay1h.html

555 Timer IC Tester

http://www.uoguelph.ca/%7Eantoon/circ/555test.htm

DC Power Supply 1.25V to 25V

http://www.elecfree.com/circuit/power-supply/dc-power-supply-125v-to-25v/

5-13V Power Supply
with IC 7805 & CA3140
http://www.elecfree.com/html/Supply_Splitter_with_IC_741-TIP41_TIP42.htm

TDA1905 Amplifier CAR Audio OTL 5W

http://www.elecfree.com/circuit/car-power-amp/TDA1905-Amplifier-CAR-Audio-OTL-5W/

Supply 9VDC no transformer
http://www.elecfree.com/circuit/power-supply/supply-9vdc-no-transformer/

Miniature FM Transmitter #1

http://www.uoguelph.ca/%7Eantoon/circ/fmt1.htm

Simple Transistor Audio PreAmplifier

http://www.uoguelph.ca/%7Eantoon/circ/amp1.htm

Battery Monitor for 12V Lead-Acid

http://www.uoguelph.ca/%7Eantoon/circ/batmon12.htm

Regulator 1.25-30V 1A By LM317T

http://www.elecfree.com/circuit/power-supply/supply-regulator-125-30v-1a-by-lm317/

4 Transister (C945) tone control mono.

http://www.elecfree.com/circuit/tone-control/tone-control-mono-by-4-transister-c945/

7805+Mj2955 power supply 5V 5A for digital circuit.

http://www.elecfree.com/circuit/power-supply/7805-mj2955-power-supply-5v-5a-for-digital-circuit/

Led Flasher, 2 transistor

http://www.uoguelph.ca/%7Eantoon/circ/2qflash.htm

Wailing Alarm

http://www.uoguelph.ca/%7Eantoon/circ/wailing.htm