HA1377 Bridge Amp BCL 17W (with PCB)

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

DC Power Supply

http://www.elecfree.com/circuit/power-supply/dc-power-supply/

TDA820M Mini Amp 2W+2W

http://www.elecfree.com/circuit/power-amplifier/tda820m-mini-amp-2w2w/

Car NiCad Charger

http://www.uoguelph.ca/%7Eantoon/gadgets/carnc12.htm

TDA1908 Amplifier CAR AUDIO OTL 8W
http://www.elecfree.com/circuit/car-power-amp/car-power-amp_Circuit-02.php

Simple Regulator By Transistor (C1061)

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

Power Amplifier OCL 300W HIFI by MJ15004,MJ15003

http://www.elecfree.com/circuit/power-amplifier/300w-power-amplifier-ocl-by-transister/

Light Sensor With Hysteresis

http://www.uoguelph.ca/%7Eantoon/circ/sensor4.htm

Single Cell Sealed Lead Acid Charger

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

Power supply regulator 0-30V 1A by IC 741 + Transistor 2N3055 & 2N3565
http://www.elecfree.com/circuit/power-supply/power-supply-regulator-0-30v-1a-by-ic-741-transistor-2n3055-2n3565/

HA1377 Bridge Amplifier BCL cap 17W (with PCB)

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

Practical, 2-wire Intercom

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

Relays - Long Duration

http://www.uoguelph.ca/%7Eantoon/circ/relay7.html

Telephone Transmitter (FM)

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

Dual 12V Power Supply

http://www.uoguelph.ca/%7Eantoon/circ/741-ps.html

555 DC-AC Inverter

http://www.uoguelph.ca/%7Eantoon/circ/555dcac.html

High-Voltage Projects you can Build

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

Miniature FM Transmitter #2

http://www.uoguelph.ca/%7Eantoon/circ/fmt2.htm

Power Amplifier BCL 35W by TDA2030

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

Power amp 50W+50W for CAR
http://www.elecfree.com/circuit/car-power-amp/power-amp-50w50w-for-car/

Power Amplifier OTL 30W by IC TDA2030 +Transistor

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

Inverter 100W by IC 4047 + 2N3055 (with PCB)

DC to DC converter

http://www.elecfree.com/electronic/inverter-100w-by-ic-4047-2n3055-with-pcb/

High Current Regulated Supply

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

Power Supply Circuit

100W OCL Amplifier circuit by A1215 / C2921

http://www.elecfree.com/circuit/power-amplifier/100w-ocl-amplifier-circuit-by-a1215-c2921/

Pre Tone Control Stereo
(bass-mid range-treble) by IC NE5532

http://www.elecfree.com/circuit/tone-control/pre-tone-control-stereo-bass-mid-range-treble-by-ic-ne5532/

HYPERLINK "http://www.elecfree.com/circuit/power-amplifier/50w-amp-ocl-mosfet-k1058-j162/index.php"50W Power Amplifier OCL Mosfet (K1058 + J162)

http://www.elecfree.com/circuit/power-amplifier/50w-amp-ocl-mosfet-k1058-j162/index.php

Power supply regulator 0-50V 2A by IC LM723 + Transistor 2N3055 & BD140 & A671
http://www.elecfree.com/circuit/power-supply/power-supply-regulator-0-50v-2a-by-ic-lm723-transistor-2n3055-bd140-a671/

Logic Probe(3), Audible, TTL/CMOS

http://www.uoguelph.ca/%7Eantoon/circ/probe3.html

HA1377 Bridge Amp BCL 17W (with PCB)

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

XR2206 Function Generator.Oscilator

http://www.elecfree.com/electronic/xr2206-function-generator/

LM338 Power Supply Regulator 13.8V 5A

http://www.elecfree.com/circuit/power-supply/lm338-power-supply-regulator-138v-5a/

Circuit power supply regulator +15V +30V -15V -30V 1 A by Transistor C1061 & 2N3053

http://www.elecfree.com/circuit/power-supply/power-supply-regulator-15v-15v-1a-by-ic-7815-7915/

Supply Splitter
with IC 741& TIP41,TIP42
http://www.elecfree.com/html/5-13V_Power_Supply_with_IC_7805_CA3140.htm

Power Amplifier OTL by AC176+AC126

http://www.elecfree.com/circuit/power-amplifier/ac176ac126-power-amplifier/

Triangle and Squarewave Generator by 1458

http://www.elecfree.com/circuit/Oscillator-Generator/triangle-and-squarewave-generator/

Inverter 100W by IC 4047 + 2N3055 (with PCB)

http://www.elecfree.com/electronic/inverter-100w-by-ic-4047-2n3055-with-pcb/

Power supply regulator 0-30V 1A by IC 741 + Transistor 2N3055 & 2N3565
http://www.elecfree.com/circuit/power-supply/power-supply-regulator-0-30v-1a-by-ic-741-transistor-2n3055-2n3565/

Simplest R/C Circuit

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

HA1377 Bridge Amplifier BCL cap 17W (with PCB)

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

2 Transister (C945) tone control mono.

http://www.elecfree.com/circuit/tone-control/tone-control-mono-by-2-transister-c945/

Simple power supply regulator 12V 15V 30V by Zener diode
http://www.elecfree.com/circuit/power-supply/simple-power-supply-regulator-12v-15v-30v-by-zener-diode/

2N3055 Power Amplifier

http://www.elecfree.com/circuit/power-amplifier/2n3055-power-amplifier/

XR2206 Function Generator.

http://www.elecfree.com/electronic/xr2206-function-generator/

4013 Serial IN-OUT, PARALLEL OUT
Shift Register

http://www.elecfree.com/circuit/digital-circuit/4013-serial-in-out-parallel-out-shift-register/

Lead Acid Battery Charger with Float

http://www.uoguelph.ca/%7Eantoon/gadgets/labc2.htm

8A Regulated Power Supply for 13.8V
http://www.uoguelph.ca/%7Eantoon/circ/ps13808.html

Thermo Alarm

http://www.uoguelph.ca/%7Eantoon/circ/thermo1.html

Relays - Sound Activated, #2

http://www.uoguelph.ca/%7Eantoon/circ/relay4a.html

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

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

Variable 3 - 24 Volt
3 Amp Power Supply

http://www.elecfree.com/Variable_3-24V_Voltage_and_Current_Power_Supply.php

XR2206 Function Generator

http://www.elecfree.com/circuit/Oscillator-Generator/xr2206-function-generator/

Simple power supply regulator 12V 15V 30V by Zener diode

http://www.elecfree.com/circuit/power-supply/simple-power-supply-regulator-12v-15v-30v-by-zener-diode/

Miniature FM Transmitter #7
http://www.uoguelph.ca/%7Eantoon/circ/fmt7.html

Voltage Detector

http://www.sentex.ca/%7Emec1995/probes/v-probe1.html

Wireless Microphone

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

Thermostat

http://www.uoguelph.ca/%7Eantoon/circ/thermo2.html

Basic RF Oscillator #1

http://www.uoguelph.ca/%7Eantoon/circ/rfosc-1.htm

TDA1905 Amplifier CAR Audio OTL 5W

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

3 Transister (C945) tone control mono.

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

Regulator 5V,6V,9V,12V 1A By IC 7805,7806,7809,7812

http://www.elecfree.com/circuit/power-supply/regulator-ic-7805-7806-7809-7812/

High Pass Active Filter by LM741

http://www.elecfree.com/circuit/Oscillator-Generator/high-pass-active-filter-by-lm741/

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

Lithium-Ion Charger, Single cell

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

9 to 9 pin (Female) Nullmodem Cable

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

Dark/Light Activated Relay

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

Relays - Sound Activated, #1

http://www.uoguelph.ca/%7Eantoon/circ/relay4.html

TDA1908 Amplifier CAR AUDIO OTL 8W
http://www.elecfree.com/circuit/car-power-amp/car-power-amp_Circuit-02.php

5 Transister (C945) tone control mono.

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

Regulator 5V 3A by IC LA5105

http://www.elecfree.com/circuit/power-supply/regulator-5v-3a-by-ic-la5105/

50W OCL Mosfet (K1058 + J162)

http://www.elecfree.com/circuit/power-amplifier/50w-amp-ocl-mosfet-k1058-j162/index.php

LM338 Power Supply Regulator 13.8V 5A

http://www.elecfree.com/circuit/power-supply/lm338-power-supply-regulator-138v-5a/

Miniature FM Transmitter #5
http://www.uoguelph.ca/%7Eantoon/circ/fmt5.html

Test Probes with retractable tips
http://www.sentex.ca/%7Emec1995/probes/probes.html

Whooper Alarm, #2

http://www.uoguelph.ca/%7Eantoon/circ/whooper2.html

Clock Generator

http://www.uoguelph.ca/%7Eantoon/circ/clock1.htm

Audio Booster with 1 Transistor
http://www.uoguelph.ca/%7Eantoon/circ/audio/audio1.html

TDA1910 Amplifier OTL 10W - without muting
http://www.elecfree.com/circuit/car-power-amp/tda1910-amplifier-otl-10w-without-muting/

Active Tone Controls by Transistor

http://www.elecfree.com/circuit/tone-control/active-tone-controls-by-transistor/

LM317T Voltage Regulator
with Pass Transistor
http://www.elecfree.com/LM317T_Voltage_Regulator_Pass_Transistor.php

Power Amplifier OCL 40W by 2N3055+MJ2955

http://www.elecfree.com/electronic/40w-amp-ocl-2n3055mj2955/

Mini-Drill variable Powersupply
http://www.uoguelph.ca/%7Eantoon/circ/minidril.htm

Hobby Kits for your building pleasure

http://www.sentex.ca/%7Emec1995/kits/HobbyKits.html

Waterpump Safety Guard for Fish-pond

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

Simplest RF Transmitter

http://www.uoguelph.ca/%7Eantoon/circ/rft1.htm

Bench Top Power Supply, Part 2
http://www.uoguelph.ca/%7Eantoon/circ/ps3010/ps3010b.html

Alternating On-Off Switch, #2
http://www.uoguelph.ca/%7Eantoon/circ/alt2.html

TDA1910 Amplifier OTL 10W - with muting (with PCB)

http://www.elecfree.com/circuit/car-power-amp/tda1910-amplifier-otl-10w-with-muting/

Treble Booster By 741

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

Simple 5V 1A Switching regulator by IC LM2575-5.0

http://www.elecfree.com/electronic/simple-5v-1a-switching-regulator-by-ic-lm2575-50/

30W Amp OTL by TDA2030 +Transistor

http://www.elecfree.com/circuit/power-amplifier/30w-amp-otl-by-tda2030-transistor/

Power Amplifier Mono BCL 10W by IC TDA2005
http://www.elecfree.com/electronic/tda2005-mono-power-amp-10w-bcl/

DATA Selector by IC 4066

http://www.elecfree.com/circuit/digital-circuit/data-selector-by-ic-4066/

Hot Wire Foam Cutter, 6

http://www3.telus.net/public/aschoepp/hotwire.html

Zap Adapter

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

Touch Activated Alarm System

http://www.uoguelph.ca/%7Eantoon/circ/alarm2.htm

Red Alert Alarm, #1

http://www.uoguelph.ca/%7Eantoon/circ/RedAlert1.html