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Hi Stuee, It will help if you post the schematic.

Hi Stuee, If you need to

Dazza, I can see that the non-inverting input is adjustable from 2 to 3 Volts by the setting of R1. The diode D1 lifts U1 from ground by 0.6V and the supply voltage to U1 will be about 4.4Volts (what happened without D1?). The datasheet says minimum 4.5Volts but this might not be a big deal or is it? I don

Tomi Engdals circuit seems simple enough to build, why not give it a try? ;D

Dazza, Ok, then I am very pleased you didn

Hi Rhonn, What do you mean doomed? Maybe you have to make a small change to have the circuit work with some ordinary transistors?

Dino, I was thinking something like what I have seen on bicycles where they put two coils on the inside of the front wheel fork near the rim. Then there are small magnets on the rim with even intervals. This supplies the front and rear lights with power. It should be possible to produce power with the coils in the rotating part and have some magnets fixed close to the path of the coils. Since I don

Cdonke, It will not work with 12Volts and not with DC Volts. I think you should try another circuit; it

Mastrila, The P2 preset pot can be any type of pot you prefer, multiturn or not it

Stuee, If you have a bench power supply with adjustable current limit you can try the following: Set the output voltage to 6.9Volts turn down the current limit to zero, switch off the power supply, connect the battery (mind the polarity), switch on and set the current limit to 1 A. If everything is ok the battery will be charged over night.

Dino, Welcome to this forum. Can you mount a permanent magnet close to the rotating object? What kind of power do you need, Volts, Ampere, Watt?

Rhonn, You can safely replace the MPF970 with 2N3993 or 2N5114.

Dazza, The TL173 will not work properly on 5Volts; you should use 12Volts (10.8

What

John, how do you mean

Just like Suraj said: Increase the voltage.

Mastrila, There isn

Mastrila, 1. With P1 you can control the voltage linearly, with P2, which is a preset you adjust the maximum current (2A) and P3 is where you adjust the current normally. 2. Parallel with C5 will be fine; I assume you mean 9000 uF (micro) not 9000 mF (mili)? I don

Mastrila, If you don't know it: the maximum peak voltage for the MAX712 is 45Volts and you should stay well below this. :o

Audioguru, BTW. I believe it is UV light not IR that gives you tan??

I should work with a triac circuit to control it I think.

You can use a 3A fuse if your socket is unfused.

Sorry, i can't see the pictures Mr.PooPoo

The manufacturer of the meter might have something on there homepage, have you checked there?

The