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Chu Moy Headphone Amplifier
Posted on Wednesday, April 2, 2008   •   Category: Headphone Amplifiers


This is a Chu Moy headphone amp I made. I got the PCB design from Guzzler from Head-Fi and the original design is very popular and is here. I changed Guzzler's layout so I could use a Taiwan Alpha pot on the PCB. These pots a high quality (some say better than ALPS blue velvet) and are available from Jaycar. You can see the thread here. I also made a DIY Brown dog adapter so I could use two OPA627 single opamps in a dual opamp socket.


50MHz - 1400MHz PIC-PLL
Posted on Wednesday, April 2, 2008   •   Category: PLL Circuits


This circuit is a programmable synthesizer for various transmitters with PIC16F84, TSA5511 and 2x16 LCD display. Features of PLL module include generation of frequency from 50MHz to 1400MHz with 50KHz steps and viewing the display from 0 to 1900MHz for RX and TX modes.


USB Powered AA NiMH and NiCd Battery Charger
Posted on Tuesday, April 1, 2008   •   Category: Battery Chargers


The charger in this project is designed to charge two AA NiMH or NiCd cells of any capacity (as long as they are the same) at about 470mA. It will charge 700mAh NiCds in about 1.5 hours, 1500mAh NiMHs in about 3.5 hours, and 2500mAh NiMHs in about 5.5 hours. The charger incorporates an automatic charge cut-off circuit based on cell temperature, and the cells can be left in the charger indefinitely after cut-off.


3-Axis CNC Milling Device
Posted on Tuesday, April 1, 2008   •   Category: CNC Milling Devices


Presented here is a 3-axis CNC milling device for milling small mechanic parts. It's capable of engraving and drilling PCB boards. The milling device is a stepper motor controlled x-y table, and a motorized (z-axis) stand for a 'Dremel' tool.


RC Servo Controller with Preset
Posted on Tuesday, April 1, 2008   •   Category: RC Servo Motors


Below you find the schematics of the servo-controller I use. It is based on the PIC 16F84A from Microchip. To obtain a good resolution, I use a version of 20 MHz. It's interfacing to the serial port with a rate of 38400 baud. The PIC is controlling 12 servos in parallel with a resolution of 240 steps over 90 degrees rotation.


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