From AIWA TP-1011 mic preamp to a standalone pedal...  [schematic]

Stompboxes circuits published in magazines, books or on DIY electronics websites.

Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby DrNomis » 29 Aug 2011, 22:30

I've gotta build one of these so I can try it with my 5 Watt Legacy Tube Amp, it sounds a bit dark, so the treble boosting should brighten it a bit, the Timmy works well with the amp if the low-cut is set to maximum cut..... :hmmm:
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby oh7hhi » 30 Aug 2011, 19:08

Ok, now I've tested 1,5nF cap in tone control. It's better (I'm using 100k vol-pot), but it's not very radical. Slope is pretty gentle - of course with this kind of control, but now it cuts nicely those woofy lows to make neck pickup sound good without making bridge PU too shrill. Maybe the low input impedance cuts some high-end too...
Can't wait to try this with amp-full-blast :applause: !
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby gilmour_pugliese » 30 Aug 2011, 20:10

oh7hhi wrote:Ok, now I've tested 1,5nF cap in tone control. It's better (I'm using 100k vol-pot), but it's not very radical. Slope is pretty gentle - of course with this kind of control, but now it cuts nicely those woofy lows to make neck pickup sound good without making bridge PU too shrill. Maybe the low input impedance cuts some high-end too...
Can't wait to try this with amp-full-blast :applause: !


So you're using a 1,5n/4.7u blendable out cap like the one I've posted above?
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby oh7hhi » 30 Aug 2011, 21:04

Not quite.
My version:
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby gilmour_pugliese » 30 Aug 2011, 23:00

oh7hhi wrote:Not quite.
My version:


there's a sound difference between the two arrangements?
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby oh7hhi » 30 Aug 2011, 23:41

[quote="gilmour_pugliese] there's a sound difference between the two arrangements? [/quote]

I don't think so, atleast not very significant....
I'm using smaller cap than you because I'm using 100kOhm volume pot. That changes cut-off frequency.

Need to play a while with this. Although I'm pretty sure that I'm going back using my Omega-booster instead of this :roll: .
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby jimbop » 08 Sep 2011, 11:18

regarding the 18v power here chaps.

i have a ac adaptor: output DC 20v 750mA 15VA

i take it ill need a resistor to tame the voltage a bit but as ill be putting this pedal [if all goes well on build!]
though my fractal axe fx ultra, i dont want to do any damage by shoving too many amps at it! lol

so any advice/help before i start breadboarding will be very much appreciated. :)
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby gilmour_pugliese » 08 Sep 2011, 11:25

jim, run directly the circuit at 20V with no problems... I've tested my prototipe at 24VDC (with an Electro-Harmonix PSU) with zero issues!

For this message the author gilmour_pugliese has received thanks:
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby oh7hhi » 08 Sep 2011, 16:40

stevestrat wrote:If this seems like a stupid question I apologise, I am fairly new to pedal building. The blendable output cap, does that replace C9 or run parallel to it?


In my version, I replaced C9 with smaller value (1,5nF in my case) and put 4,7uF + 1M pot combo in parallel.
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby oh7hhi » 15 Nov 2011, 16:26

Any new ideas or experiences with this? Gilmour_pugliese? jimbop? Anyone? :D .

I haven't had used this for a long time, but yesterday I dug it out of the box and plugged it to my 18 watt TMB. It makes single coil bridge PU sound pretty fat and woody.
Has anyone come up with improvements for tone control or anything?
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby jimbop » 16 Nov 2011, 18:55

well, done a version [diff trannys] on breadboard which i have to re check as it dont work lol.
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby oh7hhi » 14 Mar 2012, 14:36

There seems to be another version of this preamp: http://www.badgereffects.com/badger1011.html
Personally I don't like the idea of having mains voltage under my foot. I'm glad they only have 120VAC version so I don't have to buy it :wink: .

I'd like to see what mods they did, since it doesn't have tone control. I guess smaller coupling caps at least... Maybe someone could buy and trace it :roll: ?

Here's another: http://gsp.rocks.de/shop/index.php?main_page=product_info&products_id=33&language=en .
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby ZenM » 28 Apr 2012, 00:14

Any updates? Can someone upload a sounddemo?

How is the sound you can get out of this device - compared to the BSM RPA from treblebooster.net ?


Or does someone have a workalike for the BSM RPA (Major) ? I really don´t believe that this boosters are worth 250Euro..
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby DrNomis » 28 Apr 2012, 02:29

I'm still yet to build myself one.... :oops:
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby deafbutpicky » 13 May 2012, 15:35

Hi there,
I'm a long time reader but not so much of an poster on this forum but finally I can contribute smth:

As I stumbled over gilmour_pugliese's last layout I found the 100k resistor from the voltage divider of the 3rd stage missing.
I'm using capacitors to replace my guitar effects and give more clarity to the sound.
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby gilmour_pugliese » 13 May 2012, 17:17

deafbutpicky wrote:Hi there,
I'm a long time reader but not so much of an poster on this forum but finally I can contribute smth:

As I stumbled over gilmour_pugliese's last layout I found the 100k resistor from the voltage divider of the 3rd stage missing.


Image
:horsey:
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby deafbutpicky » 13 May 2012, 17:27

Well, must be a ghost then.
In your attachment from Version 1.35 (10 Aug 11) it's not present :scratch:
I'm using capacitors to replace my guitar effects and give more clarity to the sound.
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby gilmour_pugliese » 13 May 2012, 18:07

deafbutpicky wrote:Well, must be a ghost then.
In your attachment from Version 1.35 (10 Aug 11) it's not present :scratch:


I've drawn several versions of this layout... in v1.35 I've forgot to place that resistor :horsey:
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby brdcrp » 20 Oct 2013, 23:25

gilmour_pugliese wrote:By the way, here's the ultimate layout... same as the last but with some corrections on the out cap blending scheme :horsey:


Hey! Just havin a look at this circuit - what are some other transistors that might work well in it, any theories? Some common stuff I might have in a drawer somewhere? Kinda psyched to try this out! Thanks for your work!
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby ppcnostalgic » 14 Nov 2013, 17:49

I found in my drawer some old transistors as BC4138 (hfe<350 for Q1 and Q2) and a BC238 (hfe 150 for Q3), they works. Added a 50pF Silver Mica cap between base and collector of Q1 and Q3 to smooth things out a bit, still testing......
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