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Homemade Radio Related Stuff
High Altitude Balloon with live APRS tracker, battery heater
Cross Band VHF-UHF repeater
Puxing radio serial interface schematic, easy to make
6 way broadband RF distribution 20dB coupler
Antenna 1/4 wave for 940 to 980MHz easy homemade
Antenna height measurement made easy
PA Stage temperature controlled FAN speed controller
Automatic Antenna Motor Lift system
1:1 Current Balun using 4C6 core for HF antenna.
1:1 Ruthroff's Voltage balun using 4C6 core for HF inverted VEE antenna.
Digital Amateur Callsign sender/reciever with selective call
Digital Wattmeter, from nanoWatts to KiloWatts, with AD8307, PIC16F876, LCD Display
50 Hz controlled 10 MHz refferance with PIC16 and LCD display
2m Dual gate FET Low Noise Amplifier, variable gain -20dB to +20dB
SWR Direction Coupler 5 to 500 Mhz, made to be used with the Digital Wattmeter
SWR Impedeance Bridge, Design 3SW and 9MO
Simple VCO, 300 to 500 Mhz
20m SSB Transceiver, with DDS, PIC16, 10.7Mhz IF
AP2000 VHF reconstructed to a DUAL VCO Police Scanner with PIC and LCD
1750Hz and 82.5Hz Pilot-tone generator with PIC12 IC
DCF77 a 77.5Khz reciever with computer link
DCF77 RX module, PIC16, LCD display and serial output link
144.00 Mhz 1.5Watt CW transmitter
137 Khz CW transmitter
137 Khz Big Coil antenna, over 1 square meter
27Mhz FM 0.5W transmitter
800Watt HF 4tubes amplifier
80Watt HF one transistor amplifier
1.3GHz Freq counter LED display, main design by OZ1DV
1.7GHz Freq counter LCD display, main design by AADE
2500 W PA controller with PIC16
20 Watt Dummy load using SMD resistors
80 Watt UHF PA, modified NMT transmitter

Other Homemade Electronics Stuff Not Radio Amateur:
Raspberry PI highend hifi musik player streamer
Raspberry Pi-Fi sound cards modifications PCM5102 PCM5222
UPS inverter battery backup pure sine
Peacefair PZEM-021 energy meter hacked SPI to SERIAL output avr mega88
IR night light for CCTV auto on/off sunlight controlled with LDR
SimpleLight Aquarium sunrise moonrise controller cheap and simple white and blue mixture controller>
Multi purpose IO board AVR Atmel Mega DMX PPM analog sample and interfacing RS232 RS422 RS485
Variable Power resistor load very usefull and simple item
LED white light bulb mains powered, no loss power supply, ultra green
XMON PC windows program download, Micro controller development debugging realtime curve variable
ComMail PC windows program download, Micro controller Arduino what ever, Comport Serial text to EMAIL, URL deliver data, ThingSpeak
Hot-Mouse modified PC mouse with heat inside
AVR ISP MK2 modding USB power supply
Atmel Mega32 8ch Analog Signal Measurent and serial port logger
ADC logger 6ch Measurent and serial port logger with wireless longrange link
Atmel Mega88 LED Temperature meter type K sensor, Heat set and regulator
Atmel Mega88 LED dual temperature meter 2006
Atmel Mega88 LED temperature meter 2015
PIC 16 DemoKit3 with Programmer and more
PIC16C84/F84 door entry dual code system
PIC16 driving a 640 x 480 TFT directly
Four Temperatures 8 digit LED termometer, using PIC16 and LM50B
IR controll sampler using 6116 RAM no CPU
IR controll sampler using Zilog Z8 microcontroller and 6116 RAM
Serial Sender using 6 pcs. 4021 and crystal osc
EPROM Programmer copier manual bit edit 2704 to 27512
EPROM Sound player using counter and homemade R2R DA-Converter
EPROM Function generator
Switchmode converter 70W input:10-16VDC Output:200-300VDC
Switchmode converter 800W and Audio Amp.
Digital clock using 6 small LED Displays and pure TTL logic
Digital clock using 6 HUGE LED Displays multiplexed and PIC16
Digital clock using 6 NIXIE TUBES multiplexed 1x6 and a PIC16
Digital clock using 6 NIXIE TUBES multiplexed 2x3 and a PIC16
Digital clock using 4 ZM1040 NIXIE TUBES mux 2x2 with a PIC16
Digital clock using 2 ZM1040 NIXIE TUBES direct driven
Digital clock using 2 B7971 HUGE NIXIE TUBES, special muxed
Scope tube clock 2D vector numbers
Count Down Alarm, 3 LED Displays multiplexed and PIC16F84
Clap Sound Light Switch
First Z80 CPU system
NICD/NIMH charger, capasity measure and conditioner, with NO CPU
Z80 CPU NICD/NIMH charger computer
Battery Data Logger, discharger, ATMEGA88 and PC SW
Video Wireless realtime video downlink from my RC plane
Video OSD On Screen Display GPS data on the screen NOW with Video clips
Car timer power controller AtTiny45
"The End" Power Audio Amp
Sony CD Audio front end
ISA card, Phone answering mashine using PC and soundblaster
ISA card, RGB 16 Bit Video real time picture grapper
ISA card, 16 bit data out, 8 bit data in, LCD display
ISA card, Parallel, Serial, Midi, 2 channel DTMF decoder
DC Hi amp. load for powersupply testing
Water drain pump controller for house celler water pump
Tenma powersupply modifications
Phone USB charge hack Iphone Ipad HTC phone, how to charge via home made charge cable
Fake Alarm Blinker Push Button ON/OFF for keypad 3.6V lipo battery
SFG-1013 Signal generator TTL Output modification how to make it work
Standard Power SPS 220-24 M2564 Power Supply full teardown pictures schematic usefull for repair info

Homemade stuff RC related Planes, Cars, Boats, electronics, radiocontrol, wireless video, on screen display

Homemade PC modifications, Water cooling, and more

Other Homemade Electronics Stuff Robotics related:
6 Legged servo crawler robot using Atmel AVR controller
Playstation joystick gamepad for robot how to use it with AVR C code example
Bargraph 101 LED and Atmel AVR with C code example

Other Homemade things:
Methanol engine 10cc mounted on a small light scooter A real Psycho projekt
Electric powered Go-Cart
Soda bottle water rockets