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VOLTAGE REGULATOR MODULES (VRM) A SOLUTION FOR CPU CORE VOLTAGE ELECTRONIC CIRCUIT For each phase, the components on point (2) above which constitute all the power components are placed on a small plug-in board of 1.15? x 0.85? that delivers 40 Amps and receives the PWM TTL signal from the controller. This module has a footprint of about 0.85? x 0.25? of the motherboard space and may be placed anywhere on the board as close as possible to theCPU reducing the transmission impedance and losses and giving the Motherboard designer the flexibility to optimize the power and PCB space utilization. Each modular board may be fitted individually with its own heat sink.

Devices such as Burglar alarms and sirens, whose basic purpose is to monitor certain conditions make enjoyable projects because of the variety of sounds they can generate. Here we are going to discuss a simple dual tone alarm/siren circuit using a dual op amp MC1458, audio amplifier LM380, and a 1-W speaker. The dual op amp is used as a signal generator that produces square, pulse and triangular or sawtooth waveforms. CIRCUIT SCHEMATIC FOR DUAL TONE SIREN Read More.....