[TENS machines revisited]

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

[11.1 volts to 8.0 volts ?]

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.  :)

[11.1 volts to 8.0 volts ?]

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

[11.1 volts to 8.0 volts ?]

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. 

[11.1 volts to 8.0 volts ?]

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:

[Checking new PC power supply]

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  ;)

[Checking new PC power supply]

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.