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Hi and thanks for your help I understood all that your message said and will now get 12x330 Ohm resistors to wire before each of the LED's. There is just a bit I don't understand in your message

It should also be noted that it is preferable to use one (330 ohm) resistor per LED rather than one (e.g. 20 ohm) resistor for the whole lot, because of internal resistance deviations in each LED, as

Hi Pedro, If you want to run the 16 LED's at 30 mA each, your 12V power supply must have at least 500 mA (16 X 30 mA=480 mA) or better capability. A power supply with 1A capability would run much

Use a resistor that will limit the current to about 30mA so that not too much current is drawn and the LEDs will be bright enough. An LED will drop about 2V so, that would leave 10V to drop across

The first thing that I would do is open it up and see where the jack sits on the board and wiggle it around a little to see if the solder joints are loose. If so, just hit them with a soldering iron

supply to No...sorry. I didn't mean to make you type out that long explanation; I hope it helps someone else. The actual *input* for the AC cable is messed up. Like on the cheap older keyboards -

So it's been a long week and I find that I have time on my hands. Firstly here are the solutions to the Simple Ohms law problems I set at the end of the last Email. These questions are

akirarpg@... wrote: ????????? I assume your talking about the cable that conects the power supply to the machine itself?? If thats the case, it sounds like the wire is "Broken". This

Oh and it's DC, not AC....sorry.....

By the way, my electronics knowledge is next to nil...

Is there a way to fix a messed up AC input? It's the 9V input for my Roland TR-606 analog drum machine. It still works, but I have to wrap the cable around the 606 and get it at a certain angle

--- Gururaj V <gururaj@...> wrote: This refers to the power supply. Many analog circuits (op amps as an example) are designed requiring +12 or 15 VDC and -12 or 15 VDC. the power

a in If you're not sending it over the public telephone system, maybe you could consider using CAT5 cable instead of straight phone wire. It's not that much more expensive and has a lot more

Hai Moderator, I am new,and also my English is not good. I like to place a Topic ie ; " Replacing Final Tubes with Power MosFET " Could you give me what the disadvantages interm of Sound quality..???

This is great! Too basic for me but I trust you'll get to parts I'm unsure about. Keep it coming. ralph

Just for our beginners, Here is some basic information on ohms law, and resistance calculations. I hope they are helpful. I'm starting here as I don't know what you all know in the way of electronics,

Hi, Could anyone pls help me about the following doubts...... 1. What is meant by dual rail format? 2. What is the difference between Complementary and Differential of two signals? Thanks

O.K., For those of you who are beginers, you may find some interesting info at: ????????????????????? http://www.rayvaughan.com/kit.htm There is some basic kit building info for

Hello, Well, I'll give a stab at it. I havn't actually done anything like this but it sounds pretty simple. Off the top of my head I would think you could take your 12V battery run it through

Can someone explain the basics of a hall effec sensor to me? I believe if I understand correctly that they sense changes in magnetic fields. Is that correct? If so are they sensitive enough to