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have the schematic for the lovepedal high volt but needs to

Posted: 07 Mar 2017, 13:06
by Belanger88
I've got the original schematic for the love pedal hi volt which is a mu-amp cascading JFET design only problem is this is the actual love pedal schematic from sean so it needs to be re-drawn I believe if I want to share and post it which I could use a hand with

Re: have the schematic for the lovepedal high volt but needs

Posted: 07 Mar 2017, 18:21
by Nocentelli
https://www.expresspcb.com

..has a free schematic drawing program which is intuitive and easy to use. Or you could email me the schematic and I'll redraw it. Pm me if you're interested in the easy option

Re: have the schematic for the lovepedal high volt but needs

Posted: 07 Mar 2017, 23:11
by Belanger88
sent you a PM

Lovepedal HiVolt

Posted: 08 Mar 2017, 23:32
by Nocentelli
https://www.freestompboxes.org/viewtopic.php?f=7&t=28214

Thanks to Belanger88 -
Hi volt schem nocentelli.png

Re: Lovepedal HiVolt

Posted: 11 Mar 2017, 12:07
by Nocentelli
Slight revision (connected "hot" ends of treble + middle EQ pots to last opamp inverting input, EQ pot lug numbers labelled)
Hi volt schem nocentelli.png

Re: Lovepedal HiVolt

Posted: 05 Apr 2017, 20:58
by gigelmargel
Hello!

I've just finished HiVolt, using the excellent layout from Effectslayout (https://effectslayouts.blogspot.ro/2017 ... 0814985595), but it didn't work. I found that the problem comes from the power supply part, which is wrong on the schematic.
So, you must disconnect 1N4001 diode from the pin 7 of MAX1044 and connect it to pin 8 (as I saw in many others schematic).

Now it works, but not as in videos. It hasn't a tight sound. It has a muffled sound. Maybe there are other errors in the schematic? I compared the FET part with BSIAB2 and some values are very different. The most strange part for me is the 33nF+10K+3.9K filter. What is for?
The tone pots has a weak action, especially for the mids.

Thank you!

Re: Lovepedal HiVolt

Posted: 05 Apr 2017, 22:07
by Nocentelli
My bad on the voltage doubler - I should have spotted that.
The EQ is weird, but pretty sure it's accurate

Re: Lovepedal HiVolt

Posted: 06 Apr 2017, 12:10
by gigelmargel
Nocentelli wrote:My bad on the voltage doubler - I should have spotted that.
The EQ is weird, but pretty sure it's accurate
The 10K+3.9K seems strange because it is easier to put a very common 14K or 15K instead :)

I will make some sound tests before the filter. I biased the last FET at 8V (half of the power supply).

Anyway, maybe someone which has the pedal can recheck the values. For example, the 820K in HiVolt is only 82K in BSIAB. I don't have many electdonic knowledges...

Re: Lovepedal HiVolt

Posted: 07 Apr 2017, 22:37
by johnk
i've built it twice using the posted schematic (with a corrected charge pump) and it doesn't sound anything like the original. the distortion is very ugly sounding so i think that there are a few more errors with the re-draw besides the charge pump.

Re: Lovepedal HiVolt

Posted: 11 Apr 2017, 20:01
by johnk
well, Jesse sent the schematic and i checked it. the only other difference besides the charge pump issue is that the 820K resistor at the gate of the 5th Jfet is an 882K one as per Sean's schematic. other than that it matches it.
i've tried both an 820K and an 82K but to no avail. this one matches the one that Jesse sent me.

Re: Lovepedal HiVolt

Posted: 12 Apr 2017, 14:49
by gigelmargel
johnk wrote:well, Jesse sent the schematic and i checked it. the only other difference besides the charge pump issue is that the 820K resistor at the gate of the 5th Jfet is an 882K one as per Sean's schematic. other than that it matches it.
i've tried both an 820K and an 82K but to no avail. this one matches the one that Jesse sent me.
After I made the link that you suggested about the pin 3 of the mid pot, mine works almost OK. The main problem is a huge noise (but, as I remeber, BSIAB is noisy by default). Moreover, the mids are a little strange, like a fixed wah :)

Thank you very much!

Re: Lovepedal HiVolt

Posted: 28 Apr 2017, 14:16
by hozy31
Hi gigelmargel, what was the link you added to lug 3 of mids pot, i can't seem to find any mention of it?

Re: Lovepedal HiVolt

Posted: 29 Apr 2017, 20:09
by gigelmargel
hozy31 wrote:Hi gigelmargel, what was the link you added to lug 3 of mids pot, i can't seem to find any mention of it?
I added link in the layout from here: http://effectslayouts.blogspot.ro/2017/ ... -volt.html...in the comments you can read exactly where :)

Good luck!

Re: Lovepedal HiVolt

Posted: 03 May 2017, 18:51
by Nocentelli
hozy31 wrote:Hi gigelmargel, what was the link you added to lug 3 of mids pot, i can't seem to find any mention of it?
Nocentelli wrote:Post subject: Re: Lovepedal HiVolt Posted: 11 Mar 2017, 12:07

Slight revision (connected "hot" ends of treble + middle EQ pots to last opamp inverting input, EQ pot lug numbers labelled)
Hi volt schem nocentelli.png
Belanger88 wrote:...only problem is this is the actual love pedal schematic from sean

Re: Lovepedal HiVolt

Posted: 02 Jun 2017, 10:24
by roseblood11
So, there is still no verified schematic?