Lovepedal - Dover Drive  [traced]

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Lovepedal - Dover Drive  [traced]

Postby Kennc_dk » 30 Jun 2017, 22:45

I have traced the 'Dover Drive' pedal from Lovepedal.

Seems like that hints from this forum were right: It's a blend of a fuzz face (dragon fuzz) and a zen drive.

Please let me know if you find mistakes or have observed differencies in component values from pedal to pedal.

Dover Drive - Traced 1.1.jpg
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Re: Dover Drive from Lovepedal Traced

Postby mirosol » 01 Jul 2017, 21:59

Here's a stripboard layout... Currently unverified.
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Re: Dover Drive from Lovepedal Traced

Postby zzztop » 02 Jul 2017, 10:23

Thank you guys!
I wonder a cut under the D3 is needed.
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Re: Dover Drive from Lovepedal Traced

Postby mirosol » 02 Jul 2017, 12:04

Yup. That cut is missing from my original file. Sorry about that. Fixed the layout....
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Re: Lovepedal - Dover Drive

Postby AuditoryDriving » 02 Jul 2017, 17:52

Thanks so much guys!!

Maybe the 81k/120k voltage divider should be replaced with a 200k trimpot? Are those fixed resistors in the original?

Thanks again!!!
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Re: Lovepedal - Dover Drive

Postby Kennc_dk » 02 Jul 2017, 18:37

yes, the two resistors are discrete.
They are highlighted on the picture attached, they are at the back left.
The reason why I think* that they are 'tweaked at the factory' is because they are very precise values and completely different values from the rest.
*That divider ratio solution, using two unique resistors values is expensive, from a production point of view.

The two resistors are used to match the clipping point of the 'zen' overdrive with output amplitude of the 'fuzz face' ;-)
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Re: Lovepedal - Dover Drive

Postby AuditoryDriving » 02 Jul 2017, 20:08

Kennc_dk wrote:yes, the two resistors are discrete.
They are highlighted on the picture attached, they are at the back left.
The reason why I think* that they are 'tweaked at the factory' is because they are very precise values and completely different values from the rest.
*That divider ratio solution, using two unique resistors values is expensive, from a production point of view.

The two resistors are used to match the clipping point of the 'zen' overdrive with output amplitude of the 'fuzz face' ;-)



Makes sense!! Many thanks, Kennc_dk!!
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Re: Lovepedal - Dover Drive

Postby bugg » 02 Jul 2017, 22:48

Got two PCB layouts worked up, getting ready to order a small batch. :thumbsup

On one I've substituted the 81.2K and 121K resistors with a series pair (75K + 6.2K, and 120K + 1K respectively) to make parts sourcing a bit easier.
On the other I've replaced them with a 25-turn trim pot, this should allow fine tuning.

Image

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Re: Lovepedal - Dover Drive

Postby mirosol » 04 Jul 2017, 14:03

Couple slight errors on the previous stripboard layout. This should work.
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Re: Lovepedal - Dover Drive

Postby mirosol » 04 Jul 2017, 21:10

Damn. Had the gain labels still in reverse. I seem to be slightly off my game... Anyway. One of our blog builders built this and apparently sounds very close to the original. So consider this verified.
(Also, if one of the mods would be so kind and remove the crap files from above - thanks!)
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Re: Lovepedal - Dover Drive

Postby ivan H » 07 Sep 2017, 02:22

Ok, so I built one of these & it does work, but I have problems. With the gain set low it functions as it should, but turning the gain past say 8-30 or 9 results in it oscillating a little & crapping out. I have no solder whiskers bridging tracks & am pretty sure correct resistor values have been used throughout (I'll go over & check), so I'm thinking to maybe try adjusting the 120k/82k voltage divider. Would this maybe help?? I do have another couple of 2N3906's I could try in it. Any input appreciated. Cheers
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Re: Lovepedal - Dover Drive

Postby artguitar » 07 Sep 2017, 20:24

Anche io stesso problema però a guadagno ore 2. Lo risolto mettendo un trimmer da 50k al posto della resistenza 33k collegata ai transistor. Prova con questa regolazione. Ciao
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Re: Lovepedal - Dover Drive

Postby ivan H » 07 Sep 2017, 22:08

Ok, my 2nd language skills are abysmal, no, non existent (& I'm computer illiterate so don't know how to get it translated), but I think I've got the gist of it, replace the 33k resistor at the collector/base junctions of the two transistors with a 50k trimmer to dial it in, at least, Im assuming you mean that 33k resistor, please correct me if Im wrong. Very much appreciated, thank you for the quick reply. Not sure on whether you have experienced the same or not, but thank you. Cheers
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Re: Lovepedal - Dover Drive

Postby artguitar » 07 Sep 2017, 23:25

you just got it right
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Re: Lovepedal - Dover Drive

Postby ivan H » 08 Sep 2017, 01:11

Thank you again. I'm off to get a trimpot now, I'm sure I'll have a resistor of suitable value once dialled in. It does sound good with the gain down low, I'm sure it'll be great when working properly. I used a Russian D9B detector diode for the germanium, measured a heap of all types I had (no 1N34A's) & used the one with the lowest measured drop. Again, you help is greatly appreciated, I'll let you know the outcome. Cheers
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Re: Lovepedal - Dover Drive

Postby di-anno » 11 Sep 2017, 15:17

thanks for sharing, i have a doubt on 330 ohm resistor , with it the whole circuit runs at 6,7volt.. too low for me. Can you measure the voltage at pin 8 of the 5532 ic? about the voltage divider i see in posted photo the color codes grey-red-black-red-brown and brown-red-black-orange-brown that means 82k and 120k with 1% tolerance.
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Re: Lovepedal - Dover Drive

Postby boukman » 13 Sep 2017, 18:02

Hi!
I have built it from one of Buggs` pcbs and it works ok but i have too much drive i think.
With the guitar volume on 10 its quite fuzzy losing definition on the bass strings.If i lower the volume it clears up.The trimmer doesn`t really lower the gain all that much.
The other thing is that with the volume of the guitar off it hums or motorboats.Someone said it is an impedance thing and putting a Klon buffer clears it.
What could i do?Do you think a 50k trimmer on the above mentioned 33k resistor on the 2n3906 could lower the gain a bit?
Thanks!!
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Re: Lovepedal - Dover Drive

Postby ozzy666 » 18 Sep 2017, 20:24

ivan H wrote:Thank you again. I'm off to get a trimpot now, I'm sure I'll have a resistor of suitable value once dialled in. It does sound good with the gain down low, I'm sure it'll be great when working properly. I used a Russian D9B detector diode for the germanium, measured a heap of all types I had (no 1N34A's) & used the one with the lowest measured drop. Again, you help is greatly appreciated, I'll let you know the outcome. Cheers


I am experiencing the same issue. Did you get it solved yet? Thanks so much!
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Re: Lovepedal - Dover Drive

Postby ozzy666 » 20 Sep 2017, 00:40

ozzy666 wrote:
ivan H wrote:Thank you again. I'm off to get a trimpot now, I'm sure I'll have a resistor of suitable value once dialled in. It does sound good with the gain down low, I'm sure it'll be great when working properly. I used a Russian D9B detector diode for the germanium, measured a heap of all types I had (no 1N34A's) & used the one with the lowest measured drop. Again, you help is greatly appreciated, I'll let you know the outcome. Cheers


I am experiencing the same issue. Did you get it solved yet? Thanks so much!


ok, I did that trick with replacing the 33k rezistor with 50k pot, but it had no effect at all. It still squeals when the gain pot is about half way up.
I also tried replace the Q1 and Q2 for 2n3906s with a different hfE. And it appears that when I use the hfE=211 for Q1 and hfE=360 for Q2, it start squealing only when the gain pot is about maxed.

Any help or advice will be greatly apreciated.
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Re: Lovepedal - Dover Drive

Postby di-anno » 20 Sep 2017, 11:16

i built the pedal and i had same oscillations issue with gain maxed and/or guitar volume closed. To avoid this i put a 100 Ohm resistor in series at pin 3 of gain pot. So it never goes to zero. i also used hfeQ1<hfeQ2. With this mod I no longer have any noise. However,now, with guitar volume closed randomly the circuit picks up radio frequencies..

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