Showing posts with label 8. Show all posts
Showing posts with label 8. Show all posts
Thursday, November 6, 2014
8 Stage LED VU Meter
The circuit below uses two quad voltage comparators (LM339) to illuminate a series of 8 LEDs indicating volume level. Each of the 8 comparators is biased at increasing voltages set by the voltage divider so that the lower right LED comes on first when the input is about 400 millivolts or about 22 milliwatts peak in an 8 ohm system.
8 Stage LED VU Meter Circuit diagram :
The divider voltages are set so that each LED represents about twice the power level as the one before so the scale extends from 22 milliwatts to about 2.5 watts when all LEDs are lit. The sensitivity can be decreased with the input control to read higher levels. I have not built or tested this circuit, so please let me know if you have problems getting it working. The power levels should be as follows:
- 1 LED = 22mW
- 2 LEDs = 42mW
- 3 LEDs = 90mW
- 4 LEDs = 175mW
- 5 LEDs = 320mW
- 6 LEDs = 650mW
- 7 LEDs = 1.2 Watts
- 8 LEDs = 2.5 watts
Monday, August 25, 2014
1946 47 Packard 8 Cylinder Clipper Tune Up System Wiring Diagram
Do you own a classic car Packard? This is the tune-up system wiring diagram of the 1946-47 Packard 8 cylinder Clipper. The Packard Clipper is a classic car that comes from the time before the World War II.
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1946-47 Packard 8 Cylinder Clipper Tune-Up System Wiring Diagram |
This wiring diagram still have a quite good condition. Herein you can see parts like: ignition switch, ammeter, instrument lamp, lighting switch, generator, distributor, magnetic starter switch, etc.
Before you do any troubleshooting work on your Clipper, we must advise you to first read and study this wiring diagram comprehensively, in order to understand things better. Finally, well let you continue your work, be safe and enjoy.
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