20 electronics circuit

TDA1908 Amplifier CAR AUDIO OTL 8W
http://www.elecfree.com/circuit/car-power-amp/car-power-amp_Circuit-02.php
Power Amplifier OCL 40W by 2N3055+MJ2955
http://www.elecfree.com/electronic/40w-amp-ocl-2n3055mj2955/
Hot Wire Foam Cutter, 3
http://members.fortunecity.co.uk/slmohr/rcinterest2.htm
Continuity Tester, Latching
http://www.uoguelph.ca/%7Eantoon/circ/latching.html
LED Voltmeter for car battery by LM324
http://www.elecfree.com/circuit/car-automotive/led-voltmeter-for-car-battery-by-lm324/
TDA1905 Amplifier CAR Audio OTL 5W
http://www.elecfree.com/circuit/car-power-amp/TDA1905-Amplifier-CAR-Audio-OTL-5W/
50W Power Amplifier OCL Mosfet (K1058 + J162)
http://www.elecfree.com/circuit/power-amplifier/50w-amp-ocl-mosfet-k1058-j162/index.php
Gate Alarm by IC 4011 http://www.elecfree.com/circuit/digital-circuit/gate-alarm-by-ic-4011/
2 Transistor 2 LED Flasher
http://www.uoguelph.ca/%7Eantoon/circ/2ledflash.html