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Special Edition Accurate LC Meter with Green Backlight LCD
Posted on Friday, April 9, 2010   •   Category: Test and Measurement

Special Edition Accurate LC Meter with Green Backlight LCD

Build your own LC Meter and start making custom made coils and inductors. This LC Meter allows to measure incredibly small inductance making it perfect tool for making all types of RF coils and inductors. LC Meter can measure inductance starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitance from 0.1pF up to 900nF. The circuit includes an auto ranging and reset switch to make sure the readings are as accurate as possible. This is a Special Edition LC Meter with upgrade to top notch components. It includes upgraded high precision capacitors, inductor, 1% Metal Film resistors and Gold Plated Machined IC Sockets, header pins and LCD header connectors. This edition is designed for professionals that require unprecedented measurement accuracy.




PCM1794A Audio DAC
Posted on Friday, April 9, 2010   •   Category: Audio DAC

PCM1794A Audio DAC

This is DAC with integrated circuit PCM1794A. It is one of excellent audio DACs from Burr Brown (Texas Instruments). It has 24-bit resolution, 192kHz sample frequency, 8x oversampling digital filter, differential current output and SNR 127dB.




DIR9001 SPDIF Decoder
Posted on Friday, April 9, 2010   •   Category: Audio DAC

DIR9001 SPDIF Decoder

For transfer of digital audio between devices is standardized S/PDIF interface (electrical) and TOSLINK (optical) for commercial use, or AES3 for professional use. S/PDIF decoder module is used for converting of this interface to I2S interface, which is usually used on audio DACs. For conversion we can use for example integrated circuit CS8416 or DIR9001. In building of DAC in past I had troubles with resetting circuit CS8416 in hardware mode. Now I select DIR9001 which works perfectly and he has lower jitter than CS8416.




USB Audio DAC with PCM2704
Posted on Friday, April 9, 2010   •   Category: Audio DAC

USB Audio DAC with PCM2704

I needed high quality DAC convertor from USB to S/PDIF. Circuit has analog output for headphones and digital S/PDIF output with electrical and optical(TOSLINK) interface. We can use too 3 HID buttons for setting volume and mute. For USB input is used standard miniUSB connector. Headphone output uses standard 3.5" stereo jack socket. For signal conversion from TTL level to differential signal is used RS-485 bus transceiver. For optical output is used optical transmitter TOTX173 from Toshiba.




USB - Relay Board
Posted on Friday, April 9, 2010   •   Category: USB Circuts

USB - Relay Board

Here is the new 6 channel relay USB board to switch different devices, lighting or motors by a computer program via the USB interface.




MAX3420 – Maxim USB Peripheral Controller
Posted on Thursday, April 8, 2010   •   Category: USB Circuts

MAX3420 – Maxim USB Peripheral Controller

The MAX3420 is a USB peripheral controller chip with an SPI bus. This page hopefully contains enough information to help you easily make use of the device in your projects. The MAX3420 provides a very simple approach to adding a USB interface to a circuit. It uses a SPI bus to connect to your system. It does require a reasonable amount of configuration and control, so you’ll need to connect it to some form of microprocessor/microcontroller.




USB audio DAC
Posted on Thursday, April 8, 2010   •   Category: Audio DAC

USB audio DAC

This is a simple USB Audio DAC based on PCM2902 chip from Texas Instruments. The power is drawn directly from USB port. Circuit includes DAC and ADC, SPDIF outputs, input and HID part with 3 buttons for MUTE, VOL+ and VOL-.




USB Device Charger
Posted on Thursday, April 8, 2010   •   Category: USB Circuts

USB Device Charger

With this tiny thing you can charge almost all devices that are charged via USB, like iPods or mobile phones, with only two AA-Cells.




2-Channel IR Relay Controller
Posted on Thursday, April 8, 2010   •   Category: Remote Control

2-Channel IR Relay Controller

This project is a 2 channel infrared (IR) remote controlled relay driver with power saving. It works with 12-bit SIRC IR signals as used by Sony remote controls. The board uses Microchip's low cost PIC10F200 microcontroller along with a handful of easy to find components making this possibly the lowest cost remote controlled relay driver around. The controller also features a power save feature which reduces the relay holding voltage to 50% of the relays nominal operating voltage once the relay has switched on.




PICkit 2 PIC Programmer
Posted on Tuesday, March 30, 2010   •   Category: PIC

PICkit 2 PIC Programmer

PICKit 2 Starter Kit is the low cost ICSP programmer for Flash PICs with USB interface introduced recently by Microchip. Only subset of PIC microcontrollers is supported, but the list is including all the recent devices from PIC16 and PIC18 families. The software upgrades are free and Microchip updates them in timely fashion. Even more, the source code and schematic are freely available.




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