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Thanks c_mitra.

It was an 8 stepper with 4 coils each a DC resistance of 5 ohms. So with them connected in series there are two coils of 10 ohms each.

It is a stepping motor so not sure if...

Thanks Guys. Looks like there is no hard and fast rule. Can't find a datasheet so will work on the premise that if it is not too hot it is not too hot.

Hi. I have an 8 wire stepper motor which I have connected the coils in series to run off an A4988 driver.

The rating on the back of the motor is 5V 1A

I am driving it with a 20 volt supply. To...

Hi guys. I am sure this question has been asked before but when I search I get so many answers that don't really apply so I am confused.

I have a 20V PSU which I want to power a 3 phase permanent...

Thank you Klaus. Those were the key words I needed.

For anyone who is interested:
- Use 2 core shielded cable for each channel.
- at 3.5mm plug. connect i core to left (or right) signal and the...

OK then Klaus. Can I do that with something like a capacitor or will it need to be something more active?

Cheers Barry. Yes, they are powered speakers.

Where should the shield connect to? The speaker GND or the 3.5 mm common?

HI. I have just bought some second hand Phonic PS6 monitor speakers to connect to my phone.

So I connected a 3.5 mm jack cable to 2 1/4" plugs for each speaker by taking the common and red wire...

Hi Klaus. Not sure what you mean.

This is a three wire motor so at least two, possibly three, of the coils must have current going through them. Can't just energise 1.

Hi. I have salvaged a three coil stepper motor and am a bit confused about how to pulse the coils to make it move. Here is a cross section image of the motor:...

Hi D. Thanks. I have seen capacitors in parallel circuits before but couldn't see the point.

Hi Brad. Yes I would if I was looking to do something practical from an interest perspective.

But, I have no 40V clock signal. Be more straight forward if I have a clock to set it up to control...

Cheers Klaus. The heat is a big issue. And ugly. It is a compromise between simple and elegant. For the moment I will have a second small 12V PSU in the case. Simple and efficient. Still a bit ugly...

Hi. I want to regulate a 45VDC unregulated power supply down to 300mA at ~12V. I was going to use a LM7812 until another member pointed out they have a max Vin of 35V. My plan was to use the circuit...

Good point Gorgon. Thank you. I will probably use a transistor+zener instead. Not sure how this will cope with transients though. I will post that question in a new topic.

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Cheers tony. A quick question about TVS diodes. The 1.5KE51CA diode you mentioned has a Minimum Breakdown Voltage of 48.5V and a Maximum Clamping Voltage of 70.1V. (which is the "maximum voltage drop...

Here you go Klaus. Let me say that originally the circuit diagram was as shown in this new schematic, but when I increased the supply voltage, the opto coupler output promptly died, so I began...

Thanks Klaus, well actually it is rather like Christmas tree lights... I will tidy it up and try again.

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Maybe what? Too much power to dissipate? How would I know? It is...

Hi. I am using a RFP50N06 MOSFET to switch 24VDC into a DC motor which can draw up to 15 A. My test circuit was like this:
http://obrazki.elektroda.pl/4707839900_1472547367_thumb.jpg

And this...

Why would there be more heat dissipated dropping 0.6V over a rectifier and dropping the same voltage using a regulator? 0.6V @ 2A either way.

By switch mode you mean a PWM setup. Right? That would...

Ooops. My mistake. It is a BD437. Thanks. But the same question still applies.

Hi. I have a 12V PSU which I want to reduce to 4V 2A PSU. I have used a NPN power transistor (BD137) plus a 270Ω resistor and a 5V zener to make a regulator which gives me a 4.4V output which is...

Sorry Klaus, that is true. And Andre, it is a 16F88 as you guessed right.

It takes perhaps 16 lines of code and speed is not really a factor.

I was just looking for a tidier way of doing it....

Hi. Is there a quick way to XOR two bits in a byte? If they are the same then do something else do something else.

I can do this using btfsc and btfss but it takes many lines of code.

Thanks.

Thanks Audioguru, you may be right as the BC547 has since died completely.

Thanks Klaus. Makes sense. I will experiment.

I take it from your suggestions that there should be no leakage...