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Dome Light Dimmer With Delay For Cars
Posted on Wednesday, November 17, 2010   •   Category: Miscellaneous


There are two stages: aboriginal one is dabbling and the additional one is fading. Back you accessible the aperture the ablaze turns on. You get central and abutting the door, but the ablaze stays on (delay stage) for an adjustable aeon of time (0-40 sec. for the ethics in the scheme, but you can calmly adapt that i.e. put a bigger capacitor) so you can see area to admit the key or do whatever you do back you get in the car, again fades abroad (fading stage) with an adjustable speed. If you affix the ACC wire (which is absolutely optional) back you about-face the key to ACC position the ablaze turns off (actually fades) alike if the dabbling date is not over (it cancels the adjournment stage).


12V to +-20V Automotive Power Converter (for audio amplifier)
Posted on Wednesday, November 17, 2010   •   Category: AC / DC Innveters


The limitation of car supply voltage (12V) forces to convert the voltages to higher in order to power audio amplifiers. In fact the max audio power x speaker (with 4 ohm impedance) using 12V is (Vsupply+ - Vsupply-)^2/(8*impedance) 12^2/32 = 4.5Watts per channel, that is laughable... For powering correctly an amplifier the best is to use a symmetric supply with a high voltage differential. for example +20 - -20 = 40Volts in fact 40^2/32 = 50 Watts per channel that is respectable. This supply is intended for two channels with 50W max each (of course it depends on the amplifier used). Though it can be easily scaled up or the voltages changed to obtain different values.


500W 12 Volt to 220 Volt Inverter
Posted on Wednesday, November 17, 2010   •   Category: AC / DC Innveters


This is circuit Inverter 12VDC to 220V 50Hz 500W. It easy to make and low cost.


12V to 220V 100W Transistor Inverter
Posted on Wednesday, November 17, 2010   •   Category: AC / DC Innveters


12V to 220V 100W transistor based power inverter.


100W Power Amp
Posted on Wednesday, November 17, 2010   •   Category: Amplifiers


This is a 100W Transistor based Power Amp Circuit. It's an old circuit, but nice circuit amplifier. Uses transistors MJ15003 and MJ15004, power supply +38V,-38V 3A. Output power is 100W for 8 OHM Speaker.


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