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I believe it would work more reliable with only one LED in series with each transistor since the voltage is low.

Hi Shahriar, I don’t know what to explain but if you keep the electromagnet cool of even better super cool then it will be more powerful.

Hi Zepplein, Here is some info about my bench PSU, I’ve got the one with 0 – 40V & 0 – 5A, it’s also available as 0 – 20V & 0 – 10A. http://www.kjell.com/filarkiv/SUPPORTPDF/41-50/44/44311/44311.pdf Here is another one similar with a different name on it: http://www.elfa.se/elfa-bin/setpage.pl?http://www.elfa.se/elfa-bin/dyndok.pl?lang=en&dok=5645.htm Works really well too! ;)

OK Nick, I did misunderstand your question! :-[ I thought you needed regulated (limited) current for the LED’s! I can see now you are using a resistor for this. So this circuit does not work? What is trigging the base of the transistor?

The motor does not have to be bigger to be stronger, the magnets and the armature winding decides the torque and power. You can re-wind the rotor (armature) with less turns of a greater gauge wire to get more power. It will of curse consume more power from the batterys too! ;)

Hi Nick, Why not use the LM317 or LM350?

Hi Nick, It depends on the power dissipation in the LM323 and the available current on the input side!

By lowering the temperature of the core and coil you can get some more magnetic power.

Your best choice is to find the webpage for the battery manufacturer and you will get the correct information.

It depends on how you use the phone line; my Internet connection, which uses the phone line, can transfer 24Mb/s (ADSL)! This is enough to watch live TV transmission in full screen with stereo sound in HiFi! ;)

Hi Guys, Today SMPSU’s are found frequently in home electronics equipment. Almost every VCR, DVD players, tuners, TV-sets and similar has got them and so do every computer laptop or other computer. The smaller and lighter SMPSU’s are cheap to make and they save weight and space in the containers shipped form Asia to US and Europe. The cabinets can be made smaller since the temperature rise and the need for cooling is less, and no bulky transformer. However I haven’t seen any in audio power amplifiers for home use yet. Audio power amplifiers for vehicles always got switchers for the step-up voltage converter. Most SMPSU’s run in the 30 – 200 kHz range and should not cause any hum in audio equipment, perhaps the high current demand in a power amp is the reason? But then again today’s computers carry PSU’s up to 700W and more at very high current levels so I’m not sure about that. BTW, my lab-PSU (0-40V 0-5A) is a switcher too! ;D

I don’t know anything about the content of the Heath books you’ve got. However the few Heath-kits I have built myself many years ago had some very pedagogical documentation. If you are going for test equipment projects I can recommend this one: http://www.uoguelph.ca/~antoon/circ/latching.html Very useful in many cases yet simple to assemble!

Hi, The STRF6552 is a voltage regulator (expensive type). A picture of the “transformer thing” would help identify it. We are waiting for the pics! ;)

I’d like a slice of that lemon in my vodka please! Oh, and some ice too! ;D

Hi helluvawreck! (No offence) ;D Welcome to our forum! You seem to have your hands in almost everything and even wants some more! I know the feeling; it’s nice to be in control of everything if possible or at least try to find out how everything works and interconnects. I would buy used test equipment to keep the prize at a reasonable level and maybe get a few extra accessories in the deal too. Do you have any special requests for projects or just anything to start with? Have you checked out our projects here on E-Lab? ;)

I guess it’s like comparing a gallon (inp. vs US) they are not even close! Or a ton vs a tonne and a ton! Or short ton = 907.2kg vs metric ton = 1000.0000000000000kg how stupid is that? ;D I stay with metric like Europe; it’s much simpler this way! 8) Or perhaps one day there is only 907mm on 1 meter!? ;D

Hi Herman, I do not have Eagle installed in my computer; you can (while Eagle displays the circuit) make a screen dump (Prnt Scrn key) and post it here. 8) For the future (wouldn’t have helped in this case but); if you have a file with a suffix not allowed (like .sch) just ZIP or RAR it and it’s possible to post it. ;)

You could use one of these, 6 or 8 A will do: http://www.elfa.se/elfa-bin/setpage.pl?http://www.elfa.se/elfa-bin/dyndok.pl?lang=en&dok=2013541.htm

Hi Jim, Your local electronics store might have a kit for you. Most simple timer kits use the 555 IC instead of the CD4060 which I prefer, but still it works as a timer.

Hi Nick, If you need hundreds of LED’s you might want to try one of these: http://www.superbrightleds.com/ http://www.dotlight.de/shop/ http://www.besthongkong.com/ ;)

Have a Good one Mixos!

Ok, it

Hi NanOp, I don

I would call this unnecessary littering!

It all depends on the engine and what