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Showing posts from August, 2021

Simple Capacitance Multiplier Power Supply Filter By Rod Elliott (Gerber & PDF) Download on Google Drive

This is an easy design to build, but requires great care to ensure that ripple currents are not superimposed on the output because of bad grounding or power wiring practices.  The schematic is drawn to show how the grounds of the various components should be interconnected, using a 'star' topology.  If this is not followed, then excessive hum will be the result. Normally, a schematic diagram is intended to show the electrical connections, rather than the physical circuit layout.  This diagram is an exception, and the physical layout should match the schematic (in as much as that is possible, at least).  Surprisingly little resistance is needed across a high current connection to produce a measurable performance degradation. Using A Capacitance Multiplier Filter With Class-AB Amps Note that this circuit is quite suitable for Class-AB amplifiers, but since their current requirements vary so widely, adding a much larger capacitance to the output is a must.  The dio...

Stereo Speaker Protector PCB Layout (Gerber & PDF) Download on Google Drive

Speaker Protector with a delay function that eliminates the thump (jeduk) sound when the amplifier is first turned on and has protection against DC voltage at the amplifier's output so that the speaker remains safe if there is a problem with the amplifier. Especially for the OCL amplifier configuration (output capacitor less) speaker protector is very important to keep the DC voltage from burning the speaker coil directly, if your amplifier is damaged due to a broken or short final transistor. Well, to prevent this, the installation of a speaker protector will be very necessary as a security measure for the speakers themselves. The component in charge of disconnecting and connecting the speaker line to the power amplifier is automatically part of the relay. This relay will not be able to work without a control circuit. Then this control circuit becomes a sensor as well as a signal in the relay to do various jobs. The following is the appearance of the speaker protector At the top t...