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Old 25th November 2006, 10:07 AM   #1
jancooo is offline jancooo  Slovenia
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Default Fuzz face problem

I've done a Fuzz face with this schematics:

Click the image to open in full size.

BUT IT DOESN't WORKS!!!

The effect is just passing a signal trought(actually sound gets a bit muddy) and i can't get a distorted tone. I used AC188 germanium PNP transistors.

Here are the pictures:
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.


If you guys can help me that would be awesome.
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Old 28th November 2006, 04:04 AM   #2
ReidK is offline ReidK  United States
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Just a couple of things, without actually tracing out the circuit:

1) Note that this is a positive-ground circuit, which is unusual by modern standards. Make sure you've got the + side of the battery (or power supply) connected to ground.

2) Are you sure that's a 100K resistor next to the transistors? It looks (on my monitor, at least) like the multiplier band is red, which wouldn't be right.

Reid
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Old 28th November 2006, 05:26 PM   #3
jancooo is offline jancooo  Slovenia
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1) I've done this.

2) Multiplier is orange. Have you compared the color with 8,2k tranzistor (which has two red bands)?


is this correct connection of the transistors???
Click the image to open in full size.Click the image to open in full size.


When I'll know how to connect transistors, i'm going to make it with PCB.
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Old 28th November 2006, 06:08 PM   #4
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Click the image to open in full size.

Starting with the tab, going clockwise, the legs are E B C. It looks like you may have the emitter/collector reversed. base looks ok. let me know how it ends up sounding, maybe i'll build one too (if you ever get yours to work )

where'd you get the transistors, they are vintage, no?
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Old 29th November 2006, 02:36 AM   #5
ReidK is offline ReidK  United States
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Quote:
Originally posted by jancooo

2) Multiplier is orange. Have you compared the color with 8,2k tranzistor (which has two red bands)?
Of course I did, but not all resistors use the same shades of color. (Look at the difference in the brown on the 100K and the brown on the 470, for example).

Speaking of brown... since the two visible bands are brown and (now I know) orange, it can't be a 100K resistor, so what is it? If it's much too low, it could cause the signal to be low and undistorted by passing too much negative feedback current to Q1. If it's 91K (white brown orange) it's probably close enough.

If the pinout posted by elementx is right, then he's correct that you've got the emitter and collector swapped. (His diagram is missing the arrowhead on the emitter.) Have you tested the transistors and measured the gain on them?

Reid
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Old 29th November 2006, 06:55 AM   #6
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To me it looks like the 100k (brown, black, yellow) resistor is 10k (brown, black, orange), and the 33k resistor might be 2.2k. I could be wrong; as you say, red and orange can be hard to differentiate.

But we shouldn't be guessing this. Get youself a multimeter and measure! Doing electronics without one is like bird-watching without binoculars: possible, but very error prone.

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Old 29th November 2006, 01:20 PM   #7
prorms is offline prorms  United States
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Default pnp

the pnp ac188 is great gremanium transistor!!!!!!!!!!!!!! i have few of them
you just got the collector and emitter mix up
after that should work great
you only reverse the pins for pnp transistor
if had ac187 it would be way the schematic show
you might wana get some transistor sockets sometimes the heat form solder can damge them
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Old 30th November 2006, 07:19 PM   #8
jancooo is offline jancooo  Slovenia
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I measured the resistor and i get 94,5k. It's not 100k, but it's close.

Today I've done a PCB and mounted everything on it, but i get no sound from it. Is it possible that i broke transistor with wrong connections?
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Old 30th November 2006, 07:32 PM   #9
ReidK is offline ReidK  United States
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Test the transistors. All you need is a battery, two resistors and a meter, and you'll know not only if they're good, but how much gain and leakage they have.
Here is a useful page.

Reid
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Old 30th November 2006, 11:02 PM   #10
prorms is offline prorms  United States
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Default transistor testing

or you could use a multimeter with a transistor test socket

just an example http://cgi.ebay.com/3-1-2-LCD-Multimeter-AC-DC-LCR-Frequency-hFE-diode_W0QQitemZ300052305536QQihZ020QQcategoryZ6699 1QQssPageNameZWDVWQQrdZ1QQcmdZViewItem?hash=item30 0052305536


it say transistor testing
i know thiers other way but i use
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