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    PROBLEms of LM317

    Not to be blunt, but - no. The -1.2 V is the answer.  It regualtion comes from the LM317. if you feed it the negitive ref voltage, you will get 0 volts out. I have heard of Boostraping OpAmps with high power transistors to make high power amps and also using Ziners and high power amps to...
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    Need help driving two IPS1031 Low-Side MOSFETs from a PIC

    Ick, I see what you mean. The Min Switch on voltage is 4.5v
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    Need help driving two IPS1031 Low-Side MOSFETs from a PIC

    The part is basicly a LOGIC level MosFet. You can treat it like a on/off switch.
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    How can I make a guitar fuzz effect

    First let me say that the Texas Instruments datasheet is wrong.... Op-Amps are not for everyone.  My brother in-law for example.  Secondly let me say...     Wellll.ExcuuuuuuuUUUuuuuse me.  Forgot my Inverting vs. Non-inverting rules for a sec there. (shesh so picky.) Heres my best (and...
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    How can I make a guitar fuzz effect

    Yes, Guitar Pickups are very Hi-Z devices. But the input Z of an OpAmp with feedback should approach 10meg Ohms or more. Even without the feedback loop a standard 741 has a 2meg input on it. My gut is telling me the chip may have been damaged. I have seen a lot of 741s go south quietly.  Some...
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    How can I make a guitar fuzz effect

    Your circuit is set up as a inverting Op-Amp with Clipping. The first part of the circuit is the two 100k resistors, They form a Virtual Ground for the OpAmp. The 741 is designed to run on a dual supply. By Cutting the 9v in half, the 4.5v that appears at pin 3 Appears to be the ground for the...
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    How can I make a guitar fuzz effect

    SORRY, SORRY.
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    How can I make a guitar fuzz effect

    Fuzz is just a VERY BAD amp. The classic sound is the Jimmy Hendrix sound. I attached the circuit that makes that sound when driven by the right pickups. I am not sure what pickups he used.  I am guessing they were just stratocaster single coil pickups.  Humbuckers came along later. If you are...
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    Biuld UPS...

    An entire schematic with parts would fill several pages. The basics of a UPS are just a two units. - a charger to keep the batteries topped off. - a Inverter to change the power from DC to AC. The charger isn't to complex. The Inverter is the tricky part. All an inverter does is create a...
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    alternator

    What is your goal? Are you trying to turn a car into a generator? and why can't you use the battery? If you must do it that way you should get a REAL generator dynamo. (Don't try to spin a DC MOTOR) A real dynamo generator has wire coiled on the outside and the magnets spin on the inside...
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    convert analog to digital

    Buy a DVM. They cost between 20 and 100. IF you want to BUILD such an beastie you need several parts. (Dozens) and some skill with a microprocessor or a custom DVM chip. Cheaper and faster just to buy the DVM. -Mike
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    Moderators only

    Thank you to all the moderators. Your efforts are not being over looked. Good luck in your spam battles! -Mike
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    circuit converse High voltage AC to DC

    Did I mention arc Flash?    ;D Yea, getting a High voltage DC from a High voltage AC is a bit of an odditty. Usually if you want a High voltage you are not working with electronics so much as you are working in physics. Particle accelerators, Tesla Coils, Beam and ray generators.  These all...
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    circuit converse High voltage AC to DC

    It seems my dry wit is lost on this board. ::) My selection of the 1N4001 was meant to be funny and informative. The 4001 is arguably the most common diode in electronics.  I used the most common element to demonstrate the method of Stacking diodes to get higher voltage ratings. Sure I could...
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    Thinking about getting into electronics??

    Does he mean the upgrade for the horses? I think it can only be installed at the factory. -Mike
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    circuit converse High voltage AC to DC

    I know how to take Medium voltage AC and turn it into high voltage DC. the circuit is called a Cockroft Walton Voltage Multiplier. Build a HV Rectifier?  Hummm.  Lets see, at 50V max breakdown per diode, it would take a stack of at least 1000 1N4001 diodes in series (with a loss of 1100 volts...
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    Transformer amps

    I am guessing that ‘M/C’ means Motor Control. It also sounds like you are dealing with 3 phase Power so the motor control you are talking about Must be a fairly hefty one. What concerns me is not the 30A rating of The controller but the current demand of the Motors you plan on using.  At 220V...
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    Local Positioning System (I need some help)

    I work with AGV’s a lot. They have many ways of finding themselves and one of them is quite easy to set up. If you place 2 or 3 beacons around your driveway you can set up a nice system that will be fairly accurate. The system works like this. Beacon 1 sends out a 10khz IR signal. Beacon 1...
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    Modifying automotive tachometer for fewer cylinders...

    I would guess that is is a rare custom chip.  It could be a common part, but my experance has been that devices like that often are built around a custom part or one where they scratched the part number off the top. One way to be sure would be to use some solder wick and just desolder the gauge...
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    LED dimmer

    The human eye can only detect flickering up to about 40hz at max. Above 100hz and humans see only a solid light.  (Neon and Vapor lights flicker at 60hz) LED's can flash on and off MUCH MUCH faster, thousands of times a second. Set up a LED flasher that flashes the LEDs at 1000hz. Then control...
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