CMoy for Altoids box

This is an article about my new PCB design for CMoy headphone amplifier. Main feature is that the new PCB fits exactly to the classic Altoids tin-can. This new CMoy incorporates moreover bass-boost circuit and constant current charger for 9V battery.

ATmega16/32 Pinout Sticker

If you are playing with the ATmega16 or ATmega32 microcontroller in the DIP40 package you can put my sticker on it. The sticker describes function of all pins. Thanks to color printing you will easily recognize each group of pins like different ports, SPI, I2C, UART, JTAG, ADC.

Rotary encoder for ATS - Assembly

This article describe assembly of the "Rotary encoder for ATS" kit. It is step by step instructions manual, you can find here the photos of the board with description for each particular step.

Rotary encoder for ATS transceiver series

This equipment is dedicated for an easier control of the popular mini-transceiver AT Sprint known by ham radio operators as ATS (series ATS-2, ATS-3, A, B, B.1 compatible). Originally the ATS has just four push buttons on the top cover and in combination with the paddle it is possible to send all commands to ATS including the tuning, scanning etc. After connecting the rotary encoder accessory module an easy tune, scan and other functions are available as same as on the big size desktop transceivers. Comfort and operation is much higher even with this mini transceiver.

Make a Sound Card with PCM2704

This article relates to my previous article Make a sound card with PCM2702. In this time I used newer IC from Texas Instruments PCM2704. Thanks to this circuit with all necessary features inside 28pins SSOP package I was able to built quite small sound card. The result is sound card with size of gumstick.