Park - Auto Wah [schematic]
- analogguru
- Old Solderhand
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Interesting, I have never seen this before:
http://cgi.ebay.co.uk/Park-Auto-Wah-Mar ... dZViewItem
Somebody else ?
analogguru
http://cgi.ebay.co.uk/Park-Auto-Wah-Mar ... dZViewItem
Somebody else ?
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
- MoreCowbell
- Transistor Tuner
Information
Thats one Ive never seen either. It makes me wish I had a bunch of "expendable" money. It sounds cool from the description.
- Professor SourTone
- Solder Soldier
Looks like a Mk1 Tonebender box, and the insides look pure Colorsound.
- Ice-9
- Degoop Doctor
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Sorry to raise such an old thread but I have just picked up one of these Park Auto-Wah pedals, it's in need of some TLC. I wondered if anyone had ever drawn out the schematic for this at all. There are not many components inside and it shouldn't take long to trace but if it has already been done it could save me 20 minutes drawing it out.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
- modman
- a d m i n
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I found this:
http://c-nelson.com/1960s-park-auto-wah/
http://c-nelson.com/1960s-park-auto-wah/
Please, support freestompboxes.org on Patreon for just 1 pcb per year! Or donate directly through PayPal
- Nocentelli
- Tube Twister
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I had assumed it was going to be an envelope filter type "autowah"...
Is that four transistors? Perhaps a phase shift oscillator like schaller trem LFO coupled with a twin-t wah like the colorsound?
Is that four transistors? Perhaps a phase shift oscillator like schaller trem LFO coupled with a twin-t wah like the colorsound?
modman wrote: ↑ Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...
- Ice-9
- Degoop Doctor
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There are 5 transistors which are 2n3702 . I did make some pictures of both sides of the pcb , I will post them as soon as I get a chance.Nocentelli wrote:I had assumed it was going to be an envelope filter type "autowah"...
Is that four transistors? Perhaps a phase shift oscillator like schaller trem LFO coupled with a twin-t wah like the colorsound?
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
- Ice-9
- Degoop Doctor
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- Ice-9
- Degoop Doctor
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Sorry for the oversize pics, I have no idea why that happened ? right click and save for full picture.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
- Ice-9
- Degoop Doctor
Information
Some pot values
SPEED = 47k Linear
TONE = 5K linear
DEPTH 5k linear
I will get back to you on the other values and wiring.
SPEED = 47k Linear
TONE = 5K linear
DEPTH 5k linear
I will get back to you on the other values and wiring.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
- Ice-9
- Degoop Doctor
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The capacitor hidden under the bent over greenie cap is 1n
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
- Ice-9
- Degoop Doctor
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Everything looks correct in your schematic DanAmpora, I just traced it out following my pictures and pcb along with your schematic. Pots are all correct as well as all comp values.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
- Nocentelli
- Tube Twister
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Thanks for all the effort on this one, an interesting little circuit. I'm going to have a play with breadboarding it: Might it work with NPNs and a "positive power" scheme (i.e. not positive ground)?
modman wrote: ↑ Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...
- Manfred
- Tube Twister
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The polarity of C7 is wrong in the schematic drawing.
I created a PCB-layout clone according to the PCB-shots.
The layout component names corresponds to the names in the schematic.
Ready to print documents:
SprintLayout6 file:
ready to print documents
I created a PCB-layout clone according to the PCB-shots.
The layout component names corresponds to the names in the schematic.
Ready to print documents:
SprintLayout6 file:
ready to print documents
- Manfred
- Tube Twister
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The EDIT-button does not work, for whatever reason.
Once more, therefore:
The resistor R11 did not appear in the layout. Ready to print documents: SprintLayout6 file:
Once more, therefore:
The resistor R11 did not appear in the layout. Ready to print documents: SprintLayout6 file:
- Manfred
- Tube Twister
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You are right, not your fault.DanAmpora wrote:The indent (+) is toward the edge of the board.Manfred wrote:The polarity of C7 is wrong in the schematic drawing.
In my opinion the capacitor C7 is installed incorrectly,
because there is a negative DC voltage on the positive connection of it.
Maybe it will not be noted in practice, because the amount of the voltage is very low.