PA3HDF's projects

Permanently under construction
Designs might work, or not. Use at your own risk
Last new project: 450Khz signal generators
Last updated project: 80 MHz frequency counter
Januari 29, 2021

PC based projects: A morse practice oscillator with a LM386. 80 MHz frequency counter LC meter AD converter for LPT port	Receivers: LW receiver with a TBA120 MW receiver with a MK484 DC receiver for 80m and 40m VHF/UHF receiver with TV tuner RTL2832 based SDR receiver AVR based SDR receiver for DCF77	Measuring and test equipment: HF and VHF VSWR bridges Grid Dipper / RF generator DC dummyload ESR meter Comb generator Impedance bridge Measure Vceo of a BJT 450Khz signal generators
Antennas: GPS Antennas PA0RDT Mini Whip BC broomstick Active DCF77 antenna VLF antenna	Amplifiers / buffers: Video Amplifier 50 ohm TTL buffer Microphone pre-amplifiers	Experiments: Oscillator with Ceramic Resonator Rotational encoder from CD motor
Power Supplies: Power supply: 24V, 12V and 5V 20 to 10V DC-DC converter 3 to 5V DC-DC converter Variable Power Supply for Tube Circuits	Software: Coil Calculator (python) Bridge Calculator (python)	Chargers: PSU and NiCd charger
Embedded controllers Porting Linux to a MPC823 board AVR based USB to I2C converter 4/8 tone CTCSS encoder	Modifications Car receiver as bench amplifier OptoCAT2 modification	Tranceivers 40m tube tranceiver
Old radio BX373A	-	Miscellaneous Driving a white LED from 1.5V Bringing NICD cells back to life 10V Voltage Reference