Guyatone - PS-014 Delay  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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borislavgajic
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Post by borislavgajic »

I like this unit.....but no chem around
any help with schem....whai BBD is inside?

boris
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lolbou
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Post by lolbou »

The PS-006 has a MN3005 in it. I don't know for this one, there has to be some extra circuitry for delay time control, but they might rely on the same basis?
- Are you a mod or a rocker?
- Uh, no, I'm a mocker.

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Post by RnFR »

are those like "coarse" and "fine" controls for the time? very cool looking pedal- 80s techy! reminds me of a boom box I had as a kid.
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borislavgajic
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Dipthonizer,seekwah,Talkingpedal,morleywha
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Post by borislavgajic »

it have footswitch for two delay times......I will have one in a fiew days.......so guts ..soon
:D
http://effectextra.blogspot.com/2010/03 ... hears.html

sound , and link to Bart's page

cheers
Boris

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borislavgajic
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...CE-2,ibanez fL301,EH theCloneTheory
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Post by borislavgajic »

PCB shoots.....sounds very nice...... :thumbsup
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borislavgajic
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Post by borislavgajic »

schem......
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borislavgajic
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Post by borislavgajic »

If you look at component side ....there is empty space for resistor, and capacitor....I that is place to modify repeat feedback loop........original resistor is 39K....and that did not make any saturation, or selfoscilation.......I placed 10nF and 22K resistor in,and there you are......now it works perfectly....there is saturation even with max delay time :D

great pedal....if you compare schem with boss delay DM2 it is almost identical......2/3 resistors are different....and BBD here is MN3205.......I like it a lot

cheers

Boris

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Post by recontravintash »

Hi there, I need some help here. I have the same pedal, but slide pots are broken, they just don't work :(
Can you help me, please? Maybe someone here know where can I find replacement for those pots.
I'll be posting guts later :)

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Post by miklax »

HI there folks!

I Have one of these for repair..
Could anyone post some pics of the wiring?
Or somekind of schemtic for it?

Some guy destroyed this one, has all the wires broken or soldered to the wrong place...
I've followed the schematic, but just wanted to be shure its ok.
At the moment, it turns on, the green led lighst up, it just doenst have any delay effect.

Cheers

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Post by Dirk_Hendrik »

The schemtic is in post number 2.
Sorry. Plain out of planes.

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Post by snk »

Hello
Thank you for the schematics.
There are 3 trimmers on the PCB : could anyone tell what do they do ?
I'm looking for longer delay times and/or more feedback (maybe up to self-resonance)...
I'm enjoying my PS014, but i find it a bit on the gentle side, and i rather prefer a more lofi sound but a greater funk factor :)
Thank you in advance

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Post by lolbou »

PVR2 sets the BBD bias (don't mess with it).

PVR3 sets the BBD's output signal symmetry (could be very lo-fi if badly tweaked)

And I think (or guess) that PVR1 sets the overall frequency for the CMOS oscillator that feeds the clock driver.

I would try to alter PVR1 to see if it changes the delay time?
- Are you a mod or a rocker?
- Uh, no, I'm a mocker.

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Post by snk »

Thank you, very useful ! :thumbsup
What is the delay bias ?
I tweaked the PVR1, but it didn't change the delay time significantly.

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Post by Tham »

borislavgajic wrote:schem......

Hi Borislav,

Where did you manage to find this schematic ?

Might you have seen one for the PS-021 Guitar Exciter which
I have posted in another thread, or even the PS-020 Bass Exciter ?

Apparently, Guyatone made a second bass exciter, PS-038 B II,
presumably a follow up to the PS-020.


http://www.bestguitarpedals.com/type/limiter/pedal

https://www.ebay.com/itm/Guyatone-PS-02 ... rmvSB=true

https://www.ebay.com/itm/Guyatone-PS-03 ... rmvSB=true


I have been looking for the PS-021's circuit for ages. I managed to
download it some years ago, but had since lost it when my old computer
crashed, and can't find the original website again.

Guyatone's circuit diagrams, especially for the old PS series during the 80s,
are very hard to find.

The original designer, Tokyo Sound Co Ltd, has long closed down.

They made some really superb, innovative and underrated
effects pedals at that time.

http://www.harmonycentral.com/forum/for ... 9/1823522-

I think they had far more skilful electronics engineers than Roland.

Thanks.

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Post by brogh »

Hello Guys :)

First post here and i need some guidance, i'm an electronics amateur and guitarist and i have a problem with this pedal, hope you can help me because it looks to be very cool, anyway...

It's a present i got, a guy had it lying around and told me " here .. you play guitar right ?" :D The pedal does not work or better ..

I opened it up to do a visual inspection and noted that the output jack had just one wire going to it :lol: , I thought hey that must be ground, and after looking at the schematic it is... i just get a squeal, when i turn the "main" knob it changes a little bit,

here's a pic of what i've added. see attachment (the output jack is on the left ) the crcles represent the soldering i've added, they correspond to the correct rig/sleeve of the jack, just to be sure i checked cables and connectors all are working.

looking at the schematic i see there's a resistor in parallel with the output jack, (r17 upper right corner ) so what i 'm staring to think is :

a) I need to connect the ground somewhere else instead of bridging it
b) I'm missing a resistor ( a resistor mounted loose on the jack connection by these precise japanese guys ? unlikely )

so i have no clue, maybe the pedal is just broken, but the fact that there was a connection missing leads me to think that someone tried to repair it and forgot to link some pieces around :P

Can you guys help me in trying to understand what's wrong ? i can do basic soldering and identify components, but that's mostly it ;)

thank You !!
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