/Schematics

1. 80

   Audio devices
   Schematics of audio devices, audio communication systems, audio effects...
   24-05-2010 - last update. Two tone siren v3, Amplifier with TDA7294, Audio amplifier 2x6W, Mosfet audio amplifier 200W/350W, Amplifier 130W max, Audio amplifier 2x100W...

2. 32

   Microcontrollers
   Microcontroller programming, code snippets, tips n' tricks...
   08-08-2007 - last update. Atmel ISP programmer, Temperature monitor, AtMega8 board, PIC programmer v1, EasyPIC3 hardware patch, Timer with AT90s2313...

3. 12

   Antennas
   Antenna drawings for most bands and also WiFi antennas.
   06-02-2007 - last update. Antennas for transmitters 88-108 MHz, Cantenna - antenna for 2.4 GHz, Quarter wave omni-directional antenna for 2.4 GHz, Eight-style antenna for 13cm band (2.4 GHz), Backfire antenna for 13cm (2.4 GHz), Eight-style antenna for 23cm (1.2 GHz)...

4. 23

   Bugs
   Various bugs, telephone bugs, FM bugs...
   05-03-2008 - last update. FM bug 420-480 MHz, 450mW FM bug, 1.5 V FM bug v2, Stronger bug, Small bug on 1.5V battery, Spy bug in a pen...

5. 63

   Radio transmitters
   Radio and TV transmitter schematics.
   09-04-2008 - last update. FM transmitter 4W, FM transmitter with 8km range, Jupiter UKW FM transmitter, 8W FM PLL transmitter with LCD display, 1W PLL FM transmitter, Stereo coder and limiter...

6. 22

   Radio receivers
   Radio receivers.
   10-08-2007 - last update. Crystal radio receiver v1, FM receiver, FM radio with 2 transistors, Passive aircraft receiver, Satellite weather receiver with 5 channels, CW detector/monitor...

7. 9

   RF amplifiers
   RF amplifiers.
   29-09-2005 - last update. RF amplifier 6-7W, Linear power amplifier for 88-108 MHz, Linear power amplifier for 433 MHz, RF TV amplifier, Power amplifier for 50 MHz, QRP linear PA for 300 KHz to 30 MHz...

8. 1

   Packet radio
   Packet radio for data communications.
   18-05-2004 - last update. ESKAY PACKET SP v9.51...

9. 4

   Radio related - misc
   Misc. radio circuits.
   23-02-2004 - last update. ELF monitor/detector, Modification of AM receiver, SW scanner converter, AF/RF signal tracer...

10. 15

    Remote control
    Devices for remote control, PC IR remotes, IrDA.
    11-10-2006 - last update. IR jammer v2, IR receiver for PC, IrDA module with TFDS4500, IR light dimmer with PIC, IrDA adapter with photo diode, IrDA receiver...

11. 22

    Security devices
    Alarms, sensors, detectors, locks...
    19-05-2007 - last update. SMS alarm - by Pance, Touch activated alarm v3, Double sensor, Light sensor, Digital combination lock, Metal detector...

12. 26

    Telephone circuits
    Phone bugs, telephone recorders, impulse counters, useful circuits...
    15-02-2006 - last update. Telephone exchange with 2 numbers, Telephone metering signal counter, Audio pickup from phone line, LED-blink monitor for phone line, Telephone line recorder v1, Telephone line recorder v2...

13. 35

    Power supply
    Power supply sources, converters, chargers...
    14-04-2011 - last update. Smart battery tester and charger, Automatic battery charger, Triac regulation, Power supply 3-30V 2.5A, Power supply 0-24V 1A or 2A, Power supply 0-15V...

14. 22

    Optics
    Light shows, light effects, optical communications...
    17-03-2007 - last update. Simple light show, Powerful light show (3 x 600W), LED blinker, Sound controlled light show, Photo-phone, LED blinker on 1.5V v2...

15. 10

    Timer-circuits
    Various timer circuits.
    06-11-2009 - last update. Darkroom timer for PCB exposure, 10 minute timer, Time switch, Digital timer, Programmable time switch, Digital stopwatch...

16. 8

    Video circuits
    Antenna amplifiers, filters, splitters, signal detectors...
    17-05-2004 - last update. Hardware subtitler, TV RF signal stealer, SCART pinout, S-video to VHS converter, Video signal splitter, Video signal amplifier...

17. 91

    Everything else
    All other unsorted but also significant schematics.
    05-05-2016 - last update. Master Clock driver for antique slave clocks, RDS decoder with ATtiny2313, Clap switch v2, CNC driver, Metal detector/seeker, Electro shocker 380V...

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