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Dearest PcBuilders, First of all, i like to say sorry for interrupting the recent topics. Because of the urgent matter ie.: Bad sector was stated on the bargraph during scandisk by start up floppy

Nick, There are probably a thousand or more different ways of making either a 1Hz oscillator or a debounce switch, with a thousand or so different IC's, one of the simplest methods (to kill two birds

Crack-man, Ask away, we'll see what we can come up with. Jon

The PCB is the circuit board, a shortened term for Printed Circuit Board. As for the jack, it should be a separate part that is attached to the PCB. it may or may not be enclosed in plastic. Under

easiest Sorry for the late response...I don't know what a PCB is. I opened up the drum machine and it appears that the little jack for the DC input (maybe that is the PCB?) is actually a part of the

Nick, Ok, that's cool ... now what you need to do is tie the reset line low (via say a 5k resistor), and tie the clock pin to +Vcc via another say 5k resistor, then pull the clock pin down to low, it

ok well I did that I used a new chip just to make shure everyting is good and I still cant get it to count. I was wondering are all of the outpst low to start because it is counted 0 so it would have

Nick, Without spending a lot of time studying the chip, it looks like a simple 2-stage binary counter ... not sure how you're going to a make a clock out of it but I will leave that up to you. Pin 1

hello I am new at this eletronics stuff so talk slow. I am working tords building a digital clock simple enuff well atleast teh concept was. well my question is I bought some counting ic that I was

Pedro, I think you will find that this is the Maximum Reverse Voltage on the leds (also known as the reverse breakdown voltage), which means that if there is any more than 5 volts applied across the

Thanks to you all for your excellent suggestions. The reverse voltage on these LED's is 5V. I take this to mean that they "want" 5V supply voltage to them. I have therefore decided (due to your help)

Jon..... Honestly, I don't even know what type of LED I have and bought these because of their ultra-bright characteristics from a surplus electronics component shop at US$ 1.20 for 30 pieces.

Robert, Depending on the type of LED you are using, let's assume that Vf is 2V - so when you put 5 of them in series, you have an actual voltage drop of 10V, leaving you 2V in excess ... so in actual

I have to agree with Troy here as one of two possibilities. I recently found this exact problem on one of my DC adapter plugs. The solder connections at the PCB had broken and needed touch up. The

Not Neccesarily .... a Television draws 0.5A @ 110/240V (depending on where you are in the world) so your television is sucking 55/120W (P=VA; 110 x 0.5 = 55) whereas the LED's running @ 12V are

I have been experimenting using leds for lighting system on my electric scooter and have built a combined back/brake light with 3 rows of 5 red leds in series operating on 12 volts SLA. The brake

16 x 30mA = 480mA. Therefore, the 12V source must be able to put out half an amp for the LEDs. half an amp! That's as much as a television draws! Wow...

Hi Pedro, If your LED doesn't produce light, simply reverse the leads and it should be in the forward current direction. Each LED has an anode and cathode end and is polarity sensitive. John

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 and

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