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Old 3rd December 2008, 01:27 AM   #1
unohu69 is offline unohu69  United States
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Question Parts Supply Question ??

Hello guy's, I have been lurking around this forum for awhile, and am grateful to the knowledgeable folks who post here.

I am verry new to DIYing, mostly concerned with guitar effects pedals, and tube amplifier.

Eventually I will attempt to build an amp.However most of my attention will be pedals, and modding out a Dyna SCA-35 stereo amp.
I was lucky enough to be given the Dyna and it works fine now, runs really hot tho. I haven't been brave enough to attempt a bias adjustment to it yet probably read up on it for a few day first.

Any way my question concerns parts. Where can I get A grab bag kinda of useful goodies for me. I would like to have a bunch of caps resistors...etc etc etc....Is there a place i can order a standard supply?
kind of like those little plastic bins with screw and nuts.... with a multitude of commonly used values and such ?or do i literally have to go unsolder the old tv in the shed ?

Thanx for any input. I will be around and I'm sure you'll be answering more of my questions in the future.....
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Old 3rd December 2008, 08:17 AM   #2
Mooly is offline Mooly  United Kingdom
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No easy answer to that one. If you intend learning and building small projects then a good supply of common parts is worthwhile. Otherwise buy for each project IMO.
What I do is have a minimum of say 10 of each value resistor ( good quality metal films 0.6 watt ) from 1 ohm to 1 meg -- E24 series. Caps, 1/4.7/10/47/100/220/470 mfd. 5 or 10 of each. Selection of semiconductors. The list goes on. After many years you have that much stuff that -- you know what it's like
All depends how serious you are. Parts suppliers do do kits of resistors and so on. They can be worthwhile. Otherwise buy separately, in any case most have minimum quantities, say 5 of any one value of cap, usually 10 for resistors. Cost wise 100 (GBP) would get a really good selection of parts.
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Old 3rd December 2008, 08:57 AM   #3
poynton is offline poynton  United Kingdom
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Default Re: Parts Supply Question ??

Quote:
Originally posted by unohu69
..............Where can I get A grab bag kinda of useful goodies for me. I would like to have a bunch of caps resistors...etc etc etc...................
Many suppliers on Fleabay do bags of components at reasonable prices.

I have purchased several lots eg mica caps from the USA.

http://cgi.ebay.com/100-PCS-BAG-OF-1...QQcmdZViewItem

http://cgi.ebay.com/Case-full-of-Mix...2em118Q2el1247

http://cgi.ebay.com/MIXED-LOT-OF-ELE...2em118Q2el1247




Andy
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Old 4th December 2008, 04:17 AM   #4
unohu69 is offline unohu69  United States
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yeah I'll probly go for a couple of those ebay deals.

Well I have decided on my first build, small very small for some of you guy's but i have to start some where.

http://www.sputnikmusic.com/lesson.php?lessonid=195

So I have the parts, however the bc548, i could not find locally, so I googled and came up with a 2n3904 or 2n3907 ?
Any way Radio Shack only had a PN2907 . So Is this still gonna work ? should I change any other values to compensate ?

and lastly im going to hook this up in an enclosure to test. I would like to use the stereo input jack to cut power when not in use. How do I do that. I know it has something to do with using the unused right side connector of the 1/4 inch jack. since a guitar is only mono which runs mono left. correct ?

thanx guy's any info would be a help.
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Old 4th December 2008, 06:37 AM   #5
poynton is offline poynton  United Kingdom
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PN2907 will not work without modification.

It is a PNP transistor whereas the BC548 is NPN

Check with Radio Shack for a small signal AF NPN transistor

examples :- 2N2222, BC107, BC108, BC109

it will save problems.

Another thing to check with a substitute is the lead order.ie BCE or CBE.

Check whats available with www.alldatasheets.com


good luck

Andy
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Old 4th December 2008, 07:14 AM   #6
Mooly is offline Mooly  United Kingdom
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You would switch the PSU ground return through the socket
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Old 5th December 2008, 07:57 PM   #7
unohu69 is offline unohu69  United States
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I just found this site, doing a search on military grade components. not sure if they are but they have a great search feature. If say I want caps, click on caps then you can search by the values your looking for. I thought it was very helpful.


http://www.tedss.com/electronic-part...20parts/browse

what do you guy's think of their prices ?? are the competitive ?
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