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

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

Postby oh7hhi » 09 Aug 2011, 16:56

Great! I'm still waiting for some parts to get it finished...

Hmm... what about the tone control? Maybe like this: http://www.muzique.com/lab/swtc.htm (second diagram from the top) .
Just have to find right values. If it has tons of boost, I guess pot value could be higher like 100k or 250k to make it more effective.
Then we should find a good value for the cap.. My opinion is that cut-off frequency should be somewhere around 800Hz - 1kHz...
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby analogguru » 09 Aug 2011, 17:09

simply change one or more of the coupling caps, which are: C5, C9 (and C7).

assuming that you used a 20k (25k) for "Mic Vol", a value of 50n for C5 will give you a roll-of off approx 250Hz, a 20n of 500 Hz, 10n 1kHz.

assuming that a 50k is used for the volume (together with the 10k resistor), use for C 9: 18n, 6n8 or 3n3.

Caution:
The more caps you change the sharper will be the roll-off.

here is a chart for the reactance of different cap values at different frequencies:

http://analogguru.an.ohost.de/techstuff/Reactance.htm

Now you are on the best way to become a bootweaker. They don´t do anything else.

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

Postby DrNomis » 09 Aug 2011, 17:18

gilmour_pugliese wrote:
DrNomis wrote:We could call this one the Deep Purple Booster, or the Black-More Booster..... :hmmm:


You're in the right, man! :popcorn:

Any thoughts for the highpass filter?



Maybe change C5 and C7 to smaller values..... :hmmm:


Check out the Rangemaster circuit and note how the cap on the input affects the overall frequency response.... :thumbsup
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby gilmour_pugliese » 09 Aug 2011, 17:52

DrNomis wrote:
gilmour_pugliese wrote:
DrNomis wrote:We could call this one the Deep Purple Booster, or the Black-More Booster..... :hmmm:


You're in the right, man! :popcorn:

Any thoughts for the highpass filter?



Maybe change C5 and C7 to smaller values..... :hmmm:


Check out the Rangemaster circuit and note how the cap on the input affects the overall frequency response.... :thumbsup


I wanna add a variable highpass (controlled by a pot) between fx out and volume pot...
http://www.muzique.com/schem/filter.htm

Could I replace the fixed resistor with a pot wired like a variable resistor?
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby oh7hhi » 09 Aug 2011, 18:00

Yeah, there's some many options... One simple solution would be blending two caps at the input, maybe something like 6.8nF and original 5uF.
Can''t remember what booster had that kind of control, some rangemaster derivative anyway... Perhaps it could placed at fx output too.
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby gilmour_pugliese » 09 Aug 2011, 18:26

analogguru wrote:Now you are on the best way to become a bootweaker. They don´t do anything else.


I'm sorry, but I don't understand your concept (my english is shit) :oops:

oh7hhi wrote:Yeah, there's some many options... One simple solution would be blending two caps at the input, maybe something like 6.8nF and original 5uF.
Can''t remember what booster had that kind of control, some rangemaster derivative anyway... Perhaps it could placed at fx output too.


this solution is used in the DAM Red Rooster :)
Now I'll test the 6,8n/5u on the output (C9) :popcorn:
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby DrNomis » 09 Aug 2011, 18:31

gilmour_pugliese wrote:
DrNomis wrote:
gilmour_pugliese wrote:
DrNomis wrote:We could call this one the Deep Purple Booster, or the Black-More Booster..... :hmmm:


You're in the right, man! :popcorn:

Any thoughts for the highpass filter?



Maybe change C5 and C7 to smaller values..... :hmmm:


Check out the Rangemaster circuit and note how the cap on the input affects the overall frequency response.... :thumbsup


I wanna add a variable highpass (controlled by a pot) between fx out and volume pot...
http://www.muzique.com/schem/filter.htm

Could I replace the fixed resistor with a pot wired like a variable resistor?



You could, but I think that would just control the slope of the rolloff rather than the cutoff frequency..... :hmmm:
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby gilmour_pugliese » 09 Aug 2011, 18:35

DrNomis wrote:
gilmour_pugliese wrote:I wanna add a variable highpass (controlled by a pot) between fx out and volume pot...
http://www.muzique.com/schem/filter.htm
Could I replace the fixed resistor with a pot wired like a variable resistor?

You could, but I think that would just control the slope of the rolloff rather than the cutoff frequency..... :hmmm:

I've already tested this arrangement... and doesn't work properly :popcorn:
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby DrNomis » 09 Aug 2011, 18:39

gilmour_pugliese wrote:
DrNomis wrote:
gilmour_pugliese wrote:I wanna add a variable highpass (controlled by a pot) between fx out and volume pot...
http://www.muzique.com/schem/filter.htm
Could I replace the fixed resistor with a pot wired like a variable resistor?

You could, but I think that would just control the slope of the rolloff rather than the cutoff frequency..... :hmmm:

I've already tested this arrangement... and doesn't work properly :popcorn:

Ah okay, well I'll have a think about this and if I come up with something I'll post it in this thread..... :thumbsup
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby gilmour_pugliese » 09 Aug 2011, 19:28

I've found my definitive arrangement with the 4.7n/4.7u on the output cap (C9) :applause:
Maybe I could lower the 4.7u to 1/2.2u :hmmm:
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby oh7hhi » 09 Aug 2011, 19:30

gilmour_pugliese wrote:this solution is used in the DAM Red Rooster :)
Now I'll test the 6,8n/5u on the output (C9) :popcorn:


If you put it at the fx output, I think pot should be quite big, say 500k or even 1Mohms (linear) to get a good range. And put the pot in series with the 5uF capacitor, not with the small one :thumbsup .
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby oh7hhi » 09 Aug 2011, 19:33

gilmour_pugliese wrote:I've found my definitive arrangement with the 4.7n/4.7u on the output cap (C9) :applause:
Maybe I could lower the 4.7u to 1/2.2u :hmmm:


Sure you can, but then the mojo is lost :blackeye ...
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby gilmour_pugliese » 09 Aug 2011, 19:51

oh7hhi wrote:
gilmour_pugliese wrote:this solution is used in the DAM Red Rooster :)
Now I'll test the 6,8n/5u on the output (C9) :popcorn:


If you put it at the fx output, I think pot should be quite big, say 500k or even 1Mohms (linear) to get a good range. And put the pot in series with the 5uF capacitor, not with the small one :thumbsup .


I've used the same arrangement of this: http://tagboardeffects.blogspot.com/201 ... hhead.html
but if I find a 500k/1M pot on my garage I'll use it :horsey:
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby gilmour_pugliese » 10 Aug 2011, 14:50

Black-More preamp, verified and final (I hope...) layout!

Hope you enjoy it... thanks to all, and God bless freestompboxes.org! :popcorn:
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby DrNomis » 10 Aug 2011, 15:07

gilmour_pugliese wrote:Black-More preamp, verified and final (I hope...) layout!

Hope you enjoy it... thanks to all, and God bless freestompboxes.org! :popcorn:




Cheers mate, I might try building this and see how it works with my 5 Watt Legacy Valve Custom 5 Plus amp.... :thumbsup
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...  [schematic]

Postby gilmour_pugliese » 10 Aug 2011, 18:37

DrNomis wrote:Cheers mate, I might try building this and see how it works with my 5 Watt Legacy Valve Custom 5 Plus amp.... :thumbsup


Let me know if you like this preamp... Today I've boxed my circuit (with a 1054 charge pump) and tested in various setups: Laney VC15, my DIY Hiwatt Custom 50 and even with a POD and works great... In my next components order I've put a 1M lin pot for out cap blending because a 100k have a limitate range...

By the way, here's the ultimate layout... same as the last but with some corrections on the out cap blending scheme :horsey:
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby DrNomis » 10 Aug 2011, 23:54

gilmour_pugliese wrote:
DrNomis wrote:Cheers mate, I might try building this and see how it works with my 5 Watt Legacy Valve Custom 5 Plus amp.... :thumbsup


Let me know if you like this preamp... Today I've boxed my circuit (with a 1054 charge pump) and tested in various setups: Laney VC15, my DIY Hiwatt Custom 50 and even with a POD and works great... In my next components order I've put a 1M lin pot for out cap blending because a 100k have a limitate range...

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




Will do mate, I'm going to try using BC549C Hi-Gain Low Noise NPN Si Transistors in my build cause I'm curious to see how well they'll work, I know it's a bit of a non-issue, but all the same.... :thumbsup
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby oh7hhi » 29 Aug 2011, 20:25

Finally got myself a proper PSU.

I like it! Just have to adjust the smaller cap at the tone control...
I replaced C9 with a small capacitor and put 5uF + 1M pot combo in parallel with it. Hope that makes sense...
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby DrNomis » 29 Aug 2011, 21:21

oh7hhi wrote:Finally got myself a proper PSU.

I like it! Just have to adjust the smaller cap at the tone control...
I replaced C9 with a small capacitor and put 5uF + 1M pot combo in parallel with it. Hope that makes sense...



I'm going to be doing a re-design of my Breadboard Power Supply Project so that it can run off a 16V/ 1.25 A Plugpack Adaptor, but I'll be using Bancika's latest DIYLC Beta to design a stripboard layout, once I'm satisfied that everything's good, I'll upload the layout in the workbench section, so please stay tuned if you're interested in building one.... :thumbsup
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Re: From AIWA TP-1011 mic preamp to a standalone pedal...

Postby gilmour_pugliese » 29 Aug 2011, 22:12

oh7hhi wrote:Finally got myself a proper PSU.

I like it! Just have to adjust the smaller cap at the tone control...
I replaced C9 with a small capacitor and put 5uF + 1M pot combo in parallel with it. Hope that makes sense...


I'm glad you like it... certainly there's a lot of pedals better than this and more versatile, but for an authentic Blackmore sound is recommended... your arrangement on C9 is similar to my "blendable out cap" mod posted some weeks ago ;)
:mrgreen:
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