Fuzz Factory NPN AC127 - PCB n Layout Inside
Guys.
I have at my disposal a lot of AC127s so I decided to make a negative ground version of the fuzz factory
Here is the schematic
Please check if everything is okay and I hadn't made any mistakes...
I have at my disposal a lot of AC127s so I decided to make a negative ground version of the fuzz factory
Here is the schematic
Please check if everything is okay and I hadn't made any mistakes...
- Attachments
-
- fuzzfactory pcb.pdf
- (13.81 KiB) Downloaded 519 times
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- fuzzfactory layout.pdf
- (27.65 KiB) Downloaded 531 times
- DrNomis
- Old Solderhand
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I just had a look at the schematic, and it appears to be all good....
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.
- RnFR
- Old Solderhand
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does the FF have that power filtering cap? seems to me, that would quell any oscillations.
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The output pot has to be in series with R6, or you have to add another 5K1 resistor in series with it and capture the output from their junction, maybe with a 100K pot.
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In that place, there is no problem, and I would even add another 100n cap in parallel with it, to kill any high frequency transients.RnFR wrote:does the FF have that power filtering cap? seems to me, that would quell any oscillations.
- DrNomis
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I just noticed something, there should be a coupling cap between the output control pot and the rest of the circuit, the cap can be anything from 10nF to 100nF, also there should be a 470 Ohm resistor going from the 5.1K collector resistor (R6) of Q3 to +V.....
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.
Guys. I Have updated the schem.
One is the the OEM configuration
Here
And here is the normal Fuzz Face configuration
(A Npn Fuzz Face with a buffer and pots instead od resistors)
Ok, as I see, the OEM Factory doesn't have the 470 Ohm resistor. Thats no problem because the pot acts as a voltage divider when the pot is not maxed. But what happens when it's maxed? The center wiper goes to 9v, that DC blocked by the cap will carry audio?
The second configuration seems more logical (and familiar) to me. But I want to preserve the circuit as original as I can.
opinions?
One is the the OEM configuration
Here
And here is the normal Fuzz Face configuration
(A Npn Fuzz Face with a buffer and pots instead od resistors)
Ok, as I see, the OEM Factory doesn't have the 470 Ohm resistor. Thats no problem because the pot acts as a voltage divider when the pot is not maxed. But what happens when it's maxed? The center wiper goes to 9v, that DC blocked by the cap will carry audio?
The second configuration seems more logical (and familiar) to me. But I want to preserve the circuit as original as I can.
opinions?
- DrNomis
- Old Solderhand
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- my favorite amplifier: Self-Built Valve Amp Head :)
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tiococo wrote:Guys. I Have updated the schem.
One is the the OEM configuration
Here
And here is the normal Fuzz Face configuration
(A Npn Fuzz Face with a buffer and pots instead od resistors)
Ok, as I see, the OEM Factory doesn't have the 470 Ohm resistor. Thats no problem because the pot acts as a voltage divider when the pot is not maxed. But what happens when it's maxed? The center wiper goes to 9v, that DC blocked by the cap will carry audio?
The second configuration seems more logical (and familiar) to me. But I want to preserve the circuit as original as I can.
opinions?
The OEM Factory configuration will work if you wire up the volume control pot so that when it's maxxed out( turned fully clockwize), the wiper is at the junction of the 5.1K (R6) resistor and the volume control....
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.
Corrected.
Done.
I'll verify the pcb and post what happens later.
Regards!
Done.
I'll verify the pcb and post what happens later.
Regards!
- Attachments
-
- fuzzfactory layout.pdf
- (14.05 KiB) Downloaded 347 times
-
- fuzzfactory pcb.pdf
- (14.35 KiB) Downloaded 310 times
HMMM...I built this as per the schematic (both ways) and with a variety of NPN's I can not for the life of me make it oscillate like the PNP version I have built (with a variety of transistors)
when the OP built this, did it oscillate properly?
thanks
when the OP built this, did it oscillate properly?
thanks
- Scruffie
- Opamp Operator
Yeah the Fuzz Factory oscillates because it's a positive ground circuit reversed (positive ground circuits don't work quite right reversed alot of the time)... if you fix it to negative ground I can see why it wouldn't.Loss1234 wrote:HMMM...I built this as per the schematic (both ways) and with a variety of NPN's I can not for the life of me make it oscillate like the PNP version I have built (with a variety of transistors)
when the OP built this, did it oscillate properly?
thanks
- soggybag
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Has anyone built this? I was just thinking about trying to do a NPN Fuzz Factory and low and behold google reveals this thread.
Blog: http://super-freq.com
The schematic is down and having read through the discussion it seems it wasn't updated when the corrections were made.
Can anyone upload a correct schematic or simply explain how to build an all-NPN negative ground Fuzz Factory?
e.g. Is it simply a case of using the Stab pot to +9v starve the collectors of all the transistors (as opposed to +9v starving Q1's collector and the emitters of Qs 2&3 in the stock Factory) and changing the volume control setup?
Here's a schematic of the stock Factory:
Can anyone upload a correct schematic or simply explain how to build an all-NPN negative ground Fuzz Factory?
e.g. Is it simply a case of using the Stab pot to +9v starve the collectors of all the transistors (as opposed to +9v starving Q1's collector and the emitters of Qs 2&3 in the stock Factory) and changing the volume control setup?
Here's a schematic of the stock Factory:
- soulsonic
- Old Solderhand
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If you want it to oscillate, you shouldn't do all NPN. As Scruffie stated earlier, the oscillation is inherent to using PNP transistors. If you swap the circuit around to make it all NPN, it won't behave the same way.
If you wanted to make a non-oscillating Fuzz Factory for some reason, you can stick with PNP and add power supply decoupling to the two PNP stages. But I think doing all this cleaning up to the circuit takes away its charm and then you may as well be making a Tone Bender mk2.
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran