Archive for February, 2009
2009 February circuits - related electronic projects and circuit diagrams (schematics), this helps you finding desired informations and facilitates your site navigation through all articles database.
In every website page you will find a special section (at the beginning or the end) with tags just like this and also different tags associated with the current article.
Tags inter-links stories with the similar content, so if you click on the tag you will find only related and relevant 2009 February content.
tba120 demodulator
Feb 21st
The TBA120 Series ICs provide a high-gain limiting IF amplifier and a quadrature coincidence detector in one package. These ICs are primarily intended for extraction of TV intercarrier sound, which (in Europe) is frequency modulated onto a 5.5MHz or 6MHz subcarrier. The TV waveform constitutes an extreme interfering signal, and the TBA120 provides superior performance in comparison to early Foster-Seeley and Ratio Detector systems, with a considerable reduction in component count. (more…)
ISD2500 Recorder
Feb 21st
The ISD2500 ChipCorder family of ICs from Winbond contains almost all the necessary hardware in a single IC to record and playback audio messages. Included on the IC is a microphone preamp and AGC suitable for a low-cost electret type microphone, an output amplifier to drive a loudspeaker, memory, an oscillator, an A/D and a D/A converter. There are four basic models; 2560, 2575, 2590 and 25120, the numbers following 25 indicate the available recording time in seconds. The memory capacity of each version is actually the same but longer recording times are achieved by using a lower sampling rate. More >
Nokia 3310 troubleshooting
Feb 20th
Nokia 3310 troubleshooting manual guide table of contents: (more…)
AD8307 power meter
Feb 19th
The circuit diagram of the power meter stands out by its simplicity, which is due to the Type AD8307 monolithic demodulating logarithmic amplifier, IC1, from Analog Devices. A power meter or RF decibel is an indispensable instrument in any radio workshop. With AD8307, a low-cost DC–500 MHz, 92 dB logarithmic amplifier that enables an accurate, not too expensive RF decibel meter to be constructed. (more…)
Digital hearing aids circuit
Feb 19th
This low-cost, general-purpose electronic digital hearing aids works off 3V DC (2×1.5V battery). Transistor T1 and associated components form the audio signal preamplifier for the acoustic signals picked up by the condenser microphone and converted into corresponding electrical signals. (more…)
BLW96 amplifier
Feb 15th
BLW96 is a HF/VHF power transistor intended for use in class-A, AB and B operated high power industrial and military transmitting equipment in the h.f. and v.h.f. band. (more…)
Nokia N82 service manual
Feb 11th
Nokia N82 service manual for level 1 and 2 content: - WARNINGS AND CAUTIONS - ESD PROTECTION - N82 CARE AND MAINTENANCE - BATTERY INFORMATION (more…)
TDA amplifier circuits
Feb 10th
TDA integrated circuits series are very well apreciated and used in amplifier designs and projects. TDA audio amplifier circuits are produced in generally by Philips and SGS-THOMSON. The most used IC is TDA2030 for small audio amplifiers kits and TDA7294 for higher power amplifiers. In this article we present some representative amplifiers schematics with TDA circuits: car and home audio amplifiers with datasheets below every circuit diagram. (more…)
LM1875
Feb 10th
LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications. The LM1875 amplifier delivers 20 watts into a 4Ω or 8Ω load on ±25V supplies. Using an 8Ω load and ±30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload protection consists of both internal current limit and thermal shutdown. (more…)
Nokia 6230 service manual
Feb 10th
Nokia 6230 service manual contains: - general info - parts lists and components layout - service software instructions - service tools - 6230 disassembly instructions - baseband troubleshooting instructions - system module - nokia 6230 schematics - car installation kit (more…)
Recent Comments