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).
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.
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.
Posted on Wednesday, November 17, 2010 • Category:
AC / DC Innveters
12V to 220V 100W transistor based power inverter.
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.
Posted on Wednesday, November 17, 2010 • Category:
Amplifiers
This is old circuit Power amp OCL, But easy circuit and very nice. To use for play music in your home. It low cost too. It use IC 741 or LF351(good) and Transistor x 4 (2N3055+MJ2955+BD139+BD140) and little component. Power supply volt +35V/-35V and 3A for Mono, 5A for Stereo.
Posted on Wednesday, November 17, 2010 • Category:
Amplifiers
PCB Tone control adjustable bass-treble Stereo by IC LM348
Posted on Wednesday, November 17, 2010 • Category:
Amplifiers
This is a small protection circuit from loudspeakers, from DC voltage that likely to exist after some damage in the power amplifier. If a DC voltage is presented in the exit of amplifier, RL1 it interrupts immediately the line of loudspeakers preventing thus to reach in he. Parallel it provides a delay time of 3 seconds from the moment where the power supply will be applied. This delay protects the loudspeakers from undesirable bangs that are observed when open the supply switch.
Posted on Wednesday, November 17, 2010 • Category:
Amplifiers
Circuit of TDA2030 amp OTL 15W
Posted on Wednesday, November 17, 2010 • Category:
Amplifiers
This is circuit Car audio Amplifier(Bridge Amplifier BCL) , It use IC HA1377, Supply Volt 12V-13V. Speaker 4 OHM. Nice Circuit and Easy to Build.
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