ante

Kumar, If you have the space on the circuit board around the IC you can make your own heatsink. A piece of aluminium fin as large as possible and just glue it with a minimum of epoxy glue to the top of the IC. 32Volts should work according to the datasheet.

Well wiseguy, do you recognise this problem then? ;D ;D

MP, I remember not long ago you commented,

Audioguru, OK, if you say so. I was just trying to give Emiliano some hope here. But 75W is not the same as 75VA where I come from. ;D

Audioguru, I agree the TO3

MP, Yes, tweaking these regulators has

Why not use a different op-amp (cmos) to save power?

Kumar, The IC is capable of 1.25A per phase and will run hot, but there is a thermal shutdown to protect it. If you have problems with thermal shutdown try to put a heatsink on the IC. What are your motor ratings?

Hi All, I need datasheet for IR 103M, it

Emiliano, BTW, two questions: What kind of transformer do you use? How close to the maximum voltage of the op-amp are you right now? What I am thinking of is if there are some volts left to the max for the opamp and you have a transformer that can be applied with some turns of wire

Kain, An excellent suggestion. That

Emiliano, In that case I

And #2

Hell, yes here are two examples:

I don

I guess not!

Kevin, I have never got any faulty regulators, but I have encountered some people that have. What it always has come down to is they aren

Steven, Do you have any pics showing the plasma glow in that bulb? 8)

Audioguru, Did you understand if the ripple was on the whole voltage range or just on the highest part? And was it with or without load or both? So, you have Farnell round the corner? And did not know it? Well what do you think of them as a supplier then? And another one: how is their prizeing compared to others you have over there?

Dazza, Yes, inductors can be paralleled but why do you want to do that? 8) Only a few times have I heard someone having trouble with the magnetic field created around an inductor. This does not mean it can

maddy, I would use a LM78S08 on a small heatsink and a pair of caps, that

Kumar, Welcome to this forum. The circuit should work the way it is shown in the data sheet. Are you using a hefty stepper motor? What voltage are you supplying to it? You say the IC gets hot, are the motor running or not?

trigger, Ok, boot from CD-Rom then

Any low ESR cap will do the job. As I think you know a capacitor resists any change in voltage, so does any other component with a capacitance. This is what makes a voltage change require high current. The driver (ICL7667) will consume high current to switch the mosfets in and out rapidly. A low ESR capacitor is capable of supplying high current with short notice a little better than a standard cap. The regulator will get a beat when the supply is turned on at first but they can take a good punch so not to worry. No diode is needed, L1 will take a part of the beat at startup but remember the current rating for this one also. I don

Imaging a forklift battery 80V and 700Ah this is a 1700kg battery, I have heard one blow (in a distance) and seen the remains. Scary thing! :o :o :o