noob fet switching question - ibanez/boss fet-switching

Shep · Post by **Shep** » 15 Jan 2009, 05:19

As you all know the 9 series aren't true BP with there fet system. just wondering if anyone has had any ideas to true bypass them because they can be really noisy.i was thinking a 3 way 3 pole switch but how would you wirer that suck in??

Thanks Tom

Dirk_Hendrik · Post by **Dirk_Hendrik** » 15 Jan 2009, 10:22

If you promise me NOT to drill one of those chunky switches in your pedal, raping the looks, I'll tell you.

nooneknows · Post by **nooneknows** » 15 Jan 2009, 10:35

Dirk_Hendrik wrote:If you promise me NOT to drill one of those chunky switches in your pedal, raping the looks, I'll tell you.

I was having a look at mister K. site yesterday and I thought the same thing...

cpm · Post by **cpm** » 15 Jan 2009, 11:26

put a board with a relay switching into the battery hole. Keeps the looks but youll need DC though

Dirk_Hendrik · Post by **Dirk_Hendrik** » 15 Jan 2009, 14:04

nooneknows wrote:
Dirk_Hendrik wrote:If you promise me NOT to drill one of those chunky switches in your pedal, raping the looks, I'll tell you.
I was having a look at mister K. site yesterday and I thought the same thing...

t's still one of the biggest examples of lack of fantasy on how to tackle the problem.

Shep · Post by **Shep** » 15 Jan 2009, 14:30

yeah was not really wanting to go drilling a massive hole in my near mint mid 80's flanger! hahaha

what have you got for me?

sevinisthenumber · Post by **sevinisthenumber** » 15 Jan 2009, 17:01

ive done the clunky 3pdt thing but wish i knew another way...

ieatyouforbreakfast · Post by **ieatyouforbreakfast** » 17 Mar 2009, 00:27

I've been looking for the input and output buffer circuit/switching circuit on this thing, and it looks different than other Arion pedals.

http://i43.tinypic.com/r27nuv.jpg
http://i39.tinypic.com/2m35r2o.jpg

http://i44.tinypic.com/8wdpms.jpg
http://i41.tinypic.com/14o3v5g.jpg

The IC is a JRC4558LD

All trannies except Q3 are C3198. Q3 is K772. Switch is latching DPDT, unlike other Arion pedals. I'm hoping that somebody's common knowledge of input and output buffers can help me figure this out. If not true bypass, are there at least ways to improve the buffer?

ieatyouforbreakfast · Post by **ieatyouforbreakfast** » 19 Mar 2009, 03:10

bump?

ieatyouforbreakfast · Post by **ieatyouforbreakfast** » 20 Mar 2009, 07:28

Nevermind, just decided to put an A/B box in there with the tuner.

cpm · Post by **cpm** » 20 Mar 2009, 12:33

you can always leave the buffers untouched if you wire true-bypass. For a tuner they dont make a difference in performance, i guess.

sevinisthenumber · Post by **sevinisthenumber** » 23 Jun 2009, 20:08

Ive done a few of the TS9's and there no prob. Will the PQ9 the same inside as far as how the buffer is located?

Evz · Post by **Evz** » 07 Jul 2009, 19:08

hello there, i've been searching the forums but couldnt seem to find a solid answer; plus ive tried comparing original ibanez/boss schematics with fet switching compared to true bypass switching...

so my question for pedals using FET switching, to remove said switching and converting to true bypass, all i need to do is remove the switching components (attached to the gate of the fets) and then jumping the Drain and Source pins of the fets?

i'm just asking because ive been wanting to reverse/ relay out some boss+ibanez pedals, but they seem to have fet switching and i was quiet sure how to remove it properly... (i was looking at a CE2 schem with FET switching where only one FET was used in the signal path, but when compared to like a TS9 or CE3 where 2 or more FETs are used, would it still be the same process?)

Thanks!
Evz

JiM · Post by **JiM** » 07 Jul 2009, 22:19

Evz wrote:to remove said switching and converting to true bypass, all i need to do is remove the switching components (attached to the gate of the fets) and then jumping the Drain and Source pins of the fets?

That's right. And you'd better remove the FET also.

Evz wrote:i was looking at a CE2 schem with FET switching where only one FET was used in the signal path

A chorus mixes the dry signal with the delayed signal, so you just need to cut the latter, as the dry signal is buffered anyway.

sevinisthenumber · Post by **sevinisthenumber** » 07 Jul 2009, 23:54

Can anyone tell me a way to make this pedal "ALWAYS ON"? Im desperate! ha!