Show Posts
Pages: [1]
1  Topics / Science and Measurement / Re: ESR meter with Arduino on: February 22, 2012, 03:53:34 pm
Hi szmeu

Thanks for that explanation... it did help.
I haven't yet studied the link you supplied but I will do after posting this smiley

Your explanation has made things MUCH clearer as to why you've shoen the parts you have.
I'll go and put the circuit together and get some new parts ordered so that I can replace my alternative parts when they arrive.

Thanks again for the explanation and your time.
2  Topics / Science and Measurement / Re: ESR meter with Arduino on: February 20, 2012, 03:31:43 pm
Sorry, I have another question regarding the transistors

I have some 2222A s but I'm struggling for the PNP transistor.
I do have some A1015 s which seems to match the voltage but the collector current is only -150 instead of -800

Will this suffice or should I try to find something better matching?

Thanks
3  Topics / Science and Measurement / Re: ESR meter with Arduino on: February 20, 2012, 03:09:32 pm
My diodes have arrived in the post today smiley

I was wondering about the 1% resistors though.
Did you choose them because you had them laying around or is it vital they should be 1%?
Will 5% resistors work but with less accurate results?

I'm going to put it together with parts I have in stock and then replace certain parts if I'm not getting the correct results.

I'll let you know how it goes smiley
4  Topics / Science and Measurement / Re: ESR meter with Arduino on: February 16, 2012, 01:05:59 pm
Thanks for that, I'll have a look through my collection and see what I can find smiley

I also have a question about the 47uf bipolar capcitor...

Does it have to be an electrolytic or would a ceramic cap work?
Also if I get to electrolytics and use them pole to pole, would it be ok to have a larger value or does it have to be 47uf?

I'm still learning myself so it will help me to understand why those particular parts were used.
I ok at building a circuit from a schematic but I don't really know why certain parts are chosen over others

Thanks again
5  Topics / Science and Measurement / Re: ESR meter with Arduino on: February 15, 2012, 05:21:20 pm
Hello szmeu

Firstly, I'd like to thank you for sharing your design with everyone.
I also intend to make this meter but have a question...

I have lots of transistors in stock but unfortunately, dont have the same ones that you've used.
If I post a list of the transistors I have, would you be able to suggest a couple that might be suitable?


Thanks again, I look forward to building my new toy smiley
Pages: [1]