Author Topic: Stable Gated PWM Progress  (Read 18604 times)

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Re: Stable Gated PWM Progress
« Reply #56 on: May 02, 2009, 15:38:31 pm »
I need at least 3 people to order the PCB, that is the minimum amount of PCBs I can order.



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Re: Stable Gated PWM Progress
« Reply #57 on: May 02, 2009, 16:35:26 pm »
Count me in for a PCB, with parts list and locations if possible.

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Re: Stable Gated PWM Progress
« Reply #58 on: May 02, 2009, 16:53:19 pm »
count me in for a pcb

I can get the parts on my own

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Re: Stable Gated PWM Progress
« Reply #59 on: May 04, 2009, 17:21:38 pm »
If anyone else wants a PCB, make sure you let me know by the end of today. I will be placing the order tomorrow.

The PCBs are to facilitate the testing of the water cell project.
Also will only provide the PCB for members of this Forum.


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Re: Stable Gated PWM Progress
« Reply #60 on: May 05, 2009, 16:13:28 pm »
I have my paypal account set up,

so the PCB is $30.00 including shipping.

also send me you mail address also.

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Re: Stable Gated PWM Progress
« Reply #61 on: May 06, 2009, 01:32:40 am »
I have a few questions, and i'll probably have a few more soon as well. I've never built a circuit before, but i learn quick ;)

Capacitors: you have them listed with capacitance, what about voltage? i was looking at some i pulled off a tv/computer/monitor, some are 50v, some are 160v, some i have to take a closer look at.

Resistors: they also have a wattage rating?

Looking at the radio shack web page i see IRF510 Mosfet, still do the job compared to IRF640? I'll have to check my local radio shack to compare as well.

I see the 2N4401 on the radio shack webpage, but not 2N2907... they have MPS2907, would that work?

What about the potentiometers, what kind of specs do they need?

Thanks for your help

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Re: Stable Gated PWM Progress
« Reply #62 on: May 06, 2009, 05:00:47 am »
In electronic circuit the voltage rating of caps should be at least 25% more than the max voltage of the circuit. so 50 volts is fine

The schematic posted is the heart of the circuit, you can see that is has 2 oshilators.

when I designed the PCB, I added a 3rd oshilator.

all 3 oshilators are identical,

Here is the schematic with the 3 oshilators.

now you don't need to assemble all 3.

Now the IRF510 is no good, it will burn up on you very fast.

I like the IRF640, or FCPF11N60, this one is even better, Higher voltage, it will handle higher EMF.

now about the other little transistors, yes any small signal switching transistors will do. I usualy get the ones from radio shack, they have a box of variety of PNPs and NPNs  276-1604 and 276-1617

Resisitors, you can use 1/4 watt. I'm building mine using 1/8 watt, but it is the 1st time I'm building with 1/8. so not sure how well will work. so untill I report back, Use 1/4. those I know it works well.


Pots, well, here it is your choice, just get 100Ks and 10Ks. I have replaced a 100K with 50K, it works fine but that Freq range is not as wide.





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Re: Stable Gated PWM Progress
« Reply #63 on: May 06, 2009, 19:05:33 pm »
If you still need one for the order, count me in or if not,
can you add me to the next batch ?

I'm leaving for work, let me know when you need the payment.

Nog.