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Dunlop CryBaby into tansformer
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Gareth Magennis
Jul 26, 2017, 2:44:55 PM7/26/17
to
My test bench has for many years had a couple of ground isolated Neve 1:1
transformers between XLR input test sockets and stereo monitors.
Which has never been a problem, but has ALWAYS been a problem connecting any
CryBaby Wah Wah pedal.
If you do, the CryBaby resonates at full volume, behaving much like turning
a VCF resonance control to full, so it self oscillates.
Why is that?
I guess that means you could never directly connect a CryBaby to any
transformer balanced mixer input.
Circuit here:
http://www.electrosmash.com/crybaby-gcb-95
Gareth.
transformers between XLR input test sockets and stereo monitors.
Which has never been a problem, but has ALWAYS been a problem connecting any
CryBaby Wah Wah pedal.
If you do, the CryBaby resonates at full volume, behaving much like turning
a VCF resonance control to full, so it self oscillates.
Why is that?
I guess that means you could never directly connect a CryBaby to any
transformer balanced mixer input.
Circuit here:
http://www.electrosmash.com/crybaby-gcb-95
Gareth.
pf...@aol.com
Jul 26, 2017, 3:32:17 PM7/26/17
to
Just for giggles, have you tried reversing the plug polarity?
Peter Wieck
Melrose Park, PA
Peter Wieck
Melrose Park, PA
Gareth Magennis
Jul 26, 2017, 3:51:02 PM7/26/17
to
wrote in message
news:e3c0123d-c6f9-4d53...@googlegroups.com...
Just for giggles, have you tried reversing the plug polarity?
Peter Wieck
Melrose Park, PA
No,I thought as it is transformer and ground isolated it shouldn't matter.
Gareth.
Gareth Magennis
Jul 26, 2017, 3:53:27 PM7/26/17
to
"Gareth Magennis" wrote in message news:Co6eB.357659$_F5.1...@fx40.am4...
The output goes into an inductor, the CryBaby doesn't seem to like it.
Gareth.
pf...@aol.com
Jul 26, 2017, 4:17:04 PM7/26/17
to
On Wednesday, July 26, 2017 at 3:51:02 PM UTC-4, Gareth Magennis wrote:
>
> No,I thought as it is transformer and ground isolated it shouldn't matter.
>
>
> Gareth.
If you have the typical "Hot-Neutral" configuration, it does - well - better stated, it can. It does not matter only with hot-hot configurations such as US 240V single-phase connections. Try reversing, and please let us know.
>
> No,I thought as it is transformer and ground isolated it shouldn't matter.
>
>
> Gareth.
Gareth Magennis
Jul 26, 2017, 5:34:02 PM7/26/17
to
wrote in message
news:96f2aad0-4bc3-4cee...@googlegroups.com...
Hi Peter, I think you have the wrong end of the stick.
This is a guitar effects pedal, a "Wah Wah".
It is a resonant circuit that emphasises mid frequencies to produce vowel
like sounds when played with a guitar.
The "problem" I have always had is that you cannot connect this to a
transformer based pre-amp, as it would seem the inductive load affects the
circuitry in a way that seems to make the resonant circuit resonate like
crazy.
This unit is intended to plug into a guitar amplifier, not a transformer
based test bed, where it misbehaves.
Gareth.
Phil Allison
Jul 26, 2017, 7:39:20 PM7/26/17
to
Gareth Magennis wrote:
-------------------------
> Which has never been a problem, but has ALWAYS been a problem connecting any
> CryBaby Wah Wah pedal.
>
> If you do, the CryBaby resonates at full volume, behaving much like turning
> a VCF resonance control to full, so it self oscillates.
> Why is that?
>
> I guess that means you could never directly connect a CryBaby to any
> transformer balanced mixer input.
>
>
** You need an active DI for that job, preferably with JFET input.
Maybe you could add 48V phantom for it to one of the XLRs with two 6.8kohms.
...... Phil
..... Phil
-------------------------
>
> My test bench has for many years had a couple of ground isolated Neve 1:1
> transformers between XLR input test sockets and stereo monitors.
>
** Are they toroidal, red coloured with black potting in the centre ?
> My test bench has for many years had a couple of ground isolated Neve 1:1
> transformers between XLR input test sockets and stereo monitors.
>
> Which has never been a problem, but has ALWAYS been a problem connecting any
> CryBaby Wah Wah pedal.
>
> If you do, the CryBaby resonates at full volume, behaving much like turning
> a VCF resonance control to full, so it self oscillates.
> Why is that?
>
> I guess that means you could never directly connect a CryBaby to any
> transformer balanced mixer input.
>
>
Maybe you could add 48V phantom for it to one of the XLRs with two 6.8kohms.
...... Phil
..... Phil
pf...@aol.com
Jul 27, 2017, 7:03:07 AM7/27/17
to
Gareth:
I know what it is - I have repaired a number similar devices for my neighbor. I suggest what I suggest due to (limited) direct experience with such devices.
If you try this suggestion and it works, good. If not, no loss.
Next thing to look for would be cold-solders or poor connections - most of what I fixed for my neighbor.
I know what it is - I have repaired a number similar devices for my neighbor. I suggest what I suggest due to (limited) direct experience with such devices.
If you try this suggestion and it works, good. If not, no loss.
Next thing to look for would be cold-solders or poor connections - most of what I fixed for my neighbor.
Gareth Magennis
Jul 27, 2017, 2:30:40 PM7/27/17
to
"Phil Allison" wrote in message
news:50dde5a8-ded1-43bf...@googlegroups.com...
I always just put it through a guitar amplifier, there is usually one
around.
Oh, I checked today and my bench doesn't actually have Neve transformers, I
used them for another project and got confused/forgot.
They are indeed the orangey coloured toroids with potting in the middle,
with a threaded insert for mounting.
The ones I used on my bench are pretty much the ones BSS used in their AR116
DI boxes.
Gareth.
Phil Allison
Jul 27, 2017, 10:07:18 PM7/27/17
to
Gareth Magennis wrote:
----------------------------
You are an expert at ambiguous posting.
> They are indeed the orangey coloured toroids with potting in the middle,
> with a threaded insert for mounting.
** Yes, that is the same kind I have seen recently.
> The ones I used on my bench are pretty much the ones BSS used in their AR116
> DI boxes.
>
** Potted in a Mu-metal box ?
Made by OEP and sold by Farnell ?
..... Phil
----------------------------
>
>
>
> ** You need an active DI for that job, preferably with JFET input.
>
> Maybe you could add 48V phantom for it to one of the XLRs with two
> 6.8kohms.
>
>
>
>
> ** You need an active DI for that job, preferably with JFET input.
>
> Maybe you could add 48V phantom for it to one of the XLRs with two
> 6.8kohms.
>
>
> ******************************************************************
>
>
> I always just put it through a guitar amplifier, there is usually one
> around.
>
>
> Oh, I checked today and my bench doesn't actually have Neve transformers, I
> used them for another project and got confused/forgot.
** So it used to have Neve transformers or never had them ?
>
>
> I always just put it through a guitar amplifier, there is usually one
> around.
>
>
> Oh, I checked today and my bench doesn't actually have Neve transformers, I
> used them for another project and got confused/forgot.
You are an expert at ambiguous posting.
> They are indeed the orangey coloured toroids with potting in the middle,
> with a threaded insert for mounting.
> The ones I used on my bench are pretty much the ones BSS used in their AR116
> DI boxes.
>
Made by OEP and sold by Farnell ?
..... Phil
Gareth Magennis
Jul 28, 2017, 4:23:40 AM7/28/17
to
"Phil Allison" wrote in message
Sounds pretty likely, I bought them a long time ago.
Gareth.
Phil Allison
Jul 28, 2017, 8:22:42 AM7/28/17
to
Gareth Magennis wrote:
-------------------------------
** Look like them ??
http://www.canford.co.uk/Images/ItemImages/large/23-064_01.jpg
.... Phil
-------------------------------
http://www.canford.co.uk/Images/ItemImages/large/23-064_01.jpg
.... Phil
Gareth Magennis
Jul 28, 2017, 2:44:14 PM7/28/17
to
"Phil Allison" wrote in message
Probably decided at the time I didn't really need the mu-metal casing, but
yes, this is the type I got.
Don't know what impedance, but got 1:1 versions.
http://uk.farnell.com/oep-oxford-electrical-products/a262a6e/transformer-audio-1-1-1-1/dp/1689033
The 4 Neve donuts went into a couple of isolator boxes at live gigs.
Still use one box between the live system and the recording laptop /
soundcard.
Gareth.
Gareth
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