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Stingray aftermarket 2 band pre

#301
Could it be to do with using the 250K pot as a volume control before the preamp?

Also, how have you set your onboard surface mount pot for the volume, maybe try tweaking that?



Stealth, if you want to have a simple tone control that only works in passive mode. See the black "V" shaped wire on the active passive switch in Domdec's schematic. You could add a passive tone control to either of those points.



I'm probably being useless again, but I'm having trouble finding the 1M RA pots. Might just use the resistor trick. Anyone tried a 1M linear pot in that position.

Only other thing I'm having trouble with now is the 500pF cap, will probably just use a 470pF there tho.
 
#302
I'm probably being useless again, but I'm having trouble finding the 1M RA pots. Might just use the resistor trick. Anyone tried a 1M linear pot in that position.

Only other thing I'm having trouble with now is the 500pF cap, will probably just use a 470pF there tho.
Click to expand...

I got my pots at Mouser. $1.50 ea. Invalid Link Removed
They also have the 500pf mica caps Invalid Link Removed If you want anoher type of cap like ceramic or film you can do a search
 
#306
i_got_a_mohawk said:
I couldn't find anything on Farnell, I'm not too keen on using mouser because unless I spend over £50, the postage is going to be about £12, which'll be higher than the cost of the components :(
Click to expand...

yeah Mouser screws you with ridiculous shipping costs. I only used them once. I bought three 1M rev pots in one shipment so I wouldn't have to use them again. they are the only company I found that has the knurled shaft ones
 
#309
received mine! :hyper:

it looks amazing, and drilled too. Fantastic job. thank you!!!! I've got a busy few weeks but that gives me time to get the components and within a month I should be able to set aside a morning to assemble the thing (note to self: easy on the caffeine, the preamp is small :) ) and have a play.

I'll post pictures and soundclips. This is going to go into my black OLP

OLP_MM2BK_ff1.gif
 
#312
i_got_a_mohawk said:
What did you have in place of the 25K pot before?

Got a picture of the preamp, incase anyone can spot anything?
Click to expand...

Since I had a passive volume placed before the preamp, I bypassed the 25k volume pot on the stingray diagram. But the preamp is acting the same with both the 250k and 25k volume pots so I don't think that's the problem. I don't have a camera right now, but I'll get pictures up as soon as I can.
 
#313
domdec314 said:
Since I had a passive volume placed before the preamp, I bypassed the 25k volume pot on the stingray diagram. But the preamp is acting the same with both the 250k and 25k volume pots so I don't think that's the problem. I don't have a camera right now, but I'll get pictures up as soon as I can.
Click to expand...

I built 3 of these preamps and they are all louder than the bypassed signal. did you test the components before soldering? something might be way out of spec. 1 out of 30 components I buy is way off, it happens
 
#314
Problem solved! I looked over the board again and noticed that I accidentally swapped the 10k and 100k resistors. They're only one color band off so I can see how I did that. Oops. Anyways, the preamp is working as it should, and the bass sounds great now. I couldn't be happier with it. Thanks UncleFluffy and anyone who helped me.
 
#315
domdec314 said:
Problem solved! I looked over the board again and noticed that I accidentally swapped the 10k and 100k resistors. They're only one color band off so I can see how I did that. Oops. Anyways, the preamp is working as it should, and the bass sounds great now. I couldn't be happier with it. Thanks UncleFluffy and anyone who helped me.
Click to expand...

Great news, and I'm also glad to hear it's not just me who has difficulty telling the difference between brown-black-yellow and brown-black-orange when the stripes get so small.
 
#319
domdec314 said:
Problem solved! I looked over the board again and noticed that I accidentally swapped the 10k and 100k resistors. They're only one color band off so I can see how I did that. Oops. Anyways, the preamp is working as it should, and the bass sounds great now. I couldn't be happier with it. Thanks UncleFluffy and anyone who helped me.
Click to expand...

glad you found the problem. I kinda figured something was out of spec on the board. I soldered the wrong component before so I have a system now where I check the component before insertion and again before soldering. then I check the solder joint with a magnifying glass. :cool:
 
#320
Got it mostly done, I'm waiting on some cloth insulated wire (my favorite look in an instrument) to finish and test. I thought I had some metal film 1% 2.2M, but I didn't so I just metered out two 5% that were within 1%. I also metered out caps that were all within 1% so this thing is pretty close to perfect as far as component values.

I don't think this is a hard build even for a beginner. The pads my be a bit tiny for the best results on your average radioshack pencil iron unless you have a brand new tip on it. You have my respect if you can get good results with one of those 70-100W 'buzz guns' cause I wouldn't even try it with one of those. I really recommend wiping the solder side of the board off with alcohol if you handled it directly, this will sometimes help in soldering smaller things. (95% of the time you'll be fine without doing that, but that 5% of the time it would have helped is usually right when its too hard to do or you already have a bad solder joint)

4669432476_18165e0c14.jpg


4669433780_dfbe282c7a.jpg


let me know if you see anything wrong ;)
 

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