Hermida Audio - Zendrive [ goop-alarm ]

potatoolay · Post by **potatoolay** » 15 Jan 2009, 16:36

alright, I built one of these from the layout below. It was really dark and muffled so I changed C3 to a 22nF and C7 to a .1uF. The results are pretty much the same. I have noticed that the "Voice" pot only makes a difference past 3 o'clock. Also, I can remove the 2N7000's completely and it makes no difference in the sound. Would someone mind to look at the layout and see if there is anything that is incorrect. Im using a TL082 (tried a 4558 also), 2N7000's, and 1N34a diodes. Im under the assumption that C2,C1, and C6 are just filtering noise so changing their values shouldnt make any difference in the overall tone? Im pretty much lost at this point.

madbean · Post by **madbean** » 15 Jan 2009, 17:23

The transistor orientation is wrong on that layout.

The diodes on each one should point towards source. On this layout D1 and Q1 are correct, but D2 and Q2 are wrong. To fix it, cut the trace connecting gate and source on Q2. Then connect the gate to the drain.

2n7000 datasheet[/i]

potatoolay · Post by **potatoolay** » 15 Jan 2009, 18:19

Thanks. Thats what I noticed when I compared it to Derik's layout, but wasnt sure if it would make a difference. Back to the iron...

Zztop128 · Post by **Zztop128** » 28 Jan 2009, 17:32

Hi

Can somebody give me the dimensions of Deric's layout?

Thanks in advance

Baml

madbean · Post by **madbean** » 03 Feb 2009, 01:55

Here's my new layout for the Zendrive. Boards and other goodies are available. (brian at madbeanpedals.com)

potatoolay · Post by **potatoolay** » 03 Feb 2009, 15:20

hahahaa, thats the best scale reference Ive ever seen.

AL · Post by AL » 03 Feb 2009, 18:43

potatoolay wrote:hahahaa, thats the best scale reference Ive ever seen.

Gimli was about 4 feet tall. That capacitor is friggin' HUGE !!!

... and thanks for the new layout.

AL

Gila_Crisis · Post by **Gila_Crisis** » 03 Feb 2009, 21:16

this weekend on mine Zendrive i changed the tone pot form 50k to 100k.
and to me now it sounds a lot better now! btw i always like so much this overdrive. much better than a fulldrive or a stock TS

gsb · Post by **gsb** » 05 Feb 2009, 07:07

Hi !
I have finished another z-drive -gsb drive for small box .I have made new PCB
and also PCB for dpdt switch .There are minimal wires inside -all is hard wired and
is realy compact .Signal routing is short and direct as posible.IC BB 2604 ,input cap 220n
output cap 1m . gsb[url=http://www.shrani.si/?6/ft/48aNa3n ... .jpg[/img]

[/url]

madbean · Post by **madbean** » 05 Feb 2009, 07:16

Very nice work. Love the Zappa 'stache. I had some PnP around here of the whole image (looks like the same one) which I was going to etch onto an enclosure....never got around to it.

gsb · Post by **gsb** » 05 Feb 2009, 07:25

HI !
I send also two eagle files from board and dpd -pcb .
gsb[url=http://www.shrani.si/?3H/zh/2OoxqC ... .jpg[/img]

[/url]

Hanglow · Post by **Hanglow** » 06 Feb 2009, 18:38

I made another one, this time with exact parts values, using Torchy's layout (a thousand thanks torchy

) and also good quality pots. simple look. Was a bit tricky fitting everything in.

Post by **audioguy** » 16 Feb 2009, 18:05

gsb wrote:HI !
I send also two eagle files from board and dpd -pcb .
gsb[url=http://www.shrani.si/?3H/zh/2OoxqC ... .jpg[/img][/url]

Can you post the foots witch Eagle part file? I've got some designs that I would like to add it to.

Thanks!

SinCityDude · Post by **SinCityDude** » 19 Feb 2009, 11:16

i bought this pedal a long time ago, could never get a use out of it.
by chance ill find it, anybody interested in reverse engineering it?it doesnt have any good at all.

gsb · Post by **gsb** » 19 Feb 2009, 11:21

I can not upload file ( the extension brd is not allowed ) send me email addres and i try to post you file.GSB

timmyo · Post by **timmyo** » 22 Feb 2009, 01:06

Hanglow wrote:I made another one, this time with exact parts values, using Torchy's layout (a thousand thanks torchy ) and also good quality pots. simple look. Was a bit tricky fitting everything in.

What size pots are they and what size enclosure is that?

Anyway - I went through this thread and couldn't find any breadboard or Vero layouts (some dead links), so I have just this evening got it down on Breadboard - is anyone interested in that layout? (although a noob I figure I have been lurking and learning long enough - if anyone will benefit then it's time to give back lol )

If anyone has a good link for Vero or Strip layout I'd appreciate it...?
If not I'll be doing it in due course and could share - just might take me a while

thanks,
Tim

Ripdivot · Post by **Ripdivot** » 22 Feb 2009, 04:28

Hanglow · Post by **Hanglow** » 22 Feb 2009, 10:13

timmyo, they are Omeg 16mm conductive plastic pots from Rapid

the box is 111mm X 60mm X 27mm

and I used that layout just posted^ and a millenium 2 for true bypass

I tend to use bigger boxes normally, so it was quite pleasing to get everything in there. my finishing skills are rubbish, so I didn't bother painting it

timmyo · Post by **timmyo** » 22 Feb 2009, 12:39

@ Ripdivot : awesome thanks

@Hanglow : cheers for that - I have used Rapid before so that's good to know.

timmyo · Post by **timmyo** » 22 Feb 2009, 22:56

I hear the original can handle 12v or 18v : will the above schematic also do so does anyone know?

Hermida Audio - Zendrive [ goop-alarm ] [traced]