HarryA

Most likely you have a few screws loose John see: http://en.allexperts.com/q/Electrical-Wiring-Home-1734/2009/6/Circuit-reads-60-volts.htm also search on: "electrical problem 60 volts on 120" good luck. addendum: As this a common problem could a poor connection between copper (or better yet corroded copper; copper oxide) and plated steel act as a diode and the the results (at very low current) is a half wave rectifier? That would yield the 60 volts rms. ref: http://www.tutorvista.com/physics/half-wave-rectifier-calculation

Thanks for the reply. I have a a 400 microsecond pulse every 20 ms that I wish to amplify. I need about 100 volts so I an thinking I need a 150-200v transistor. I need to preserve the varying amplitude so I can not just emulate it with a switching transistor. Speaking of transformers; I tried amplifying it with a 2n7000 n channel MOSFET using an audio transformer in reverse (input into the 8 ohm windings ) but I could not get a decent output pulse in spite of using various combination of diodes. HarryA \../ To close this out. I found mouser.com to be helpful as they have a system of filters that makes it easier to find what you want - with some effort. I ordered the n-channel ZVNL120 eMOSFETs from then; 200v and 120ma. The book "Electronic Devices and Circuits" by "Schaum's easy outlines" has good information on circuit design using bipolar, FETs, and MOSETs tranistors.

Hello from NE PA, Where do you all find data on MOSFET transistors? I look on ebay for MOSFETs but most do not have specs so you have to search for a data sheet, download it, open it, and find it's not what you want! I am looking for an n channel eMOSFET for a class D amplifier that has 150 to 200 volt drain to source. Some 20 to 40 ma for current. I find lots of power switching MOSFETs references. Are there any good books on using MOSFET transistors? thanks in advance, HarryA

Hello from NE PA, A question for you. How to TENS machines generate 40 to 60 volts from say 4.2 volts without using a coil or transformer? Pictured is a TENS circuit that is about 1.26 inches by 1 inch. The battery is on the reverse side of the board. thanks in advance, HarryA

I picked up some LM317's today (1.5 amperes max.). Set the output to 7.0 volts and connected to a brushed motor. The motor drew 0.68 amperes. The output voltage dropped to 6.86 volts; the li-po battery output drop to 11.55 from 11.80 volts. This is with no load on the motor; I need to get propeller on it. Someday I will receive the ESC and can reverse the motor on the fly. :)

Thanks. I replaced my diagram with the one from Motorola before seeing yours. I have power transistors coming from my favorite store - ebay. ;)

My "bright" idea is to use the mosfet to get more than the 1 ampere that the 8 volt regulator is rated at. I have a large 11.1v li-po battery for the main motor so I don't want to add another battery to get the 8 volts. I wonder if one can put two or three regulators in parallel for more current? This current is the power supply for the speed controller; it connects to the receiver for the PWM. It is the brushed type used with rc cars so it can reverse the motor for left and right control.

Hello all, I need to connect an 8 volt electronic speed control to an 11.1 battery. I have an 8 volt regulator and a power mosfet. I have not worked with mosfets before so I am puzzled on how to make the connections and what values of resistors are required. Please take a look at my diagram. Any advice would be appreciated. This motor control is for the stern of a model blimp to control the direction much like a helicopter's directional control. see:

Thanks guys. That's what I needed to know :) I made a tester out off a 12 v brake light and a 6 volt one ;)

I have a new power supply that I would like to check before installing into the computer. On bench testing it I get no voltage at all. Is thid correct? I am thinking that perhaps there is some type of interlock so you only get voltage when it is installed? thanks in advance.