Diamond Bass Comp

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Re: Diamond Bass Comp

Postby pedalgrinder » 27 Jul 2013, 22:31

I think there would be more changes than just the eq on the bass version.
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Re: Diamond Bass Comp

Postby chicago_mike » 31 Jul 2013, 17:01

May I ask what language did you write the tilt eq in? I'm learning html5 along with c#, python and a couple others.
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Re: Diamond Bass Comp

Postby Crackerman86 » 18 Dec 2014, 22:36

Anybody still care?
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Re: Diamond Bass Comp

Postby lohstah » 19 Dec 2014, 20:00

absolutely ! yes we do ! :mrgreen:
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Re: Diamond Bass Comp

Postby lohstah » 20 Dec 2014, 13:47

crackerman, do you still have the pedal ? could you find the value of the electrolytic that is sandwiched on the lower left corner in between the 104, 821 and 101 poly caps (according to my pic with the values that i posted in the first post on page 1) ? that one should be C15 according wk´s schematic, and is bigger than the 330n that is used in the guitar version.

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Re: Diamond Bass Comp

Postby lohstah » 20 Dec 2014, 17:49

power section. working on the other parts of the circuit.
i used whitekeyhole´s schemo as a basis, hope that is ok.

Power Section.jpg
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Re: Diamond Bass Comp

Postby lohstah » 20 Dec 2014, 18:50

input and comp stage. value of C15 yet unknown, something that still makes me scratch my head in the lower rigt corner of the schemo, but this is what i have so far.
Input and Opto Stage.jpg

values in red mean it´s changed from the guitar vrsion, values in black means they are the same.
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Re: Diamond Bass Comp

Postby lohstah » 20 Dec 2014, 20:00

the eq section seems to be identical, except two 15n caps can be switched in in parallel, the value of the caps which remain in the circuit all the time (C5 and C4 on wk´s schemo) is unfortunately unknown yet. the only polys i did not get a reading for, can´t remember why...it is the two caps above the big fat 100n poly marked 104G on my pic. the only other difference i can see so far is that instead of the 330n, an 4µ7 electro is in parallel with the 820p both going into the eq section (C6) and to the output (C8).
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Re: Diamond Bass Comp

Postby lohstah » 20 Dec 2014, 20:10

ok, judging from my pics i am 99% sure that C15 is 4µ7.
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Re: Diamond Bass Comp

Postby lohstah » 20 Dec 2014, 20:22

ok, we need to find out the values of these two buggers:

those two buggers.jpg
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Re: Diamond Bass Comp

Postby yeraym » 22 Dec 2014, 00:04

lohstah wrote:ok, we need to find out the values of these two buggers:

those two buggers.jpg


If you read my post you can see that the total capacitance needed to get a center frequency of 250Hz is 20nF. The ideal value for C4 and C5 is 5nF, so they problably are 5.6nF like the guitar version
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Re: Diamond Bass Comp

Postby Crackerman86 » 22 Dec 2014, 04:35

472J 4.7nF

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Re: Diamond Bass Comp

Postby Crackerman86 » 22 Dec 2014, 04:40

I would love to fix my attempt at copying this. One of the side chain outputs oscillates and I can't figure out why.
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Re: Diamond Bass Comp

Postby lohstah » 22 Dec 2014, 17:12

Power Section Revised. the 1N4004 is actually in series between C1 and C2, dropping roughly .7V i suppose. the diode across the power rails looks like a 1N4148.

Power Section.jpg
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Last edited by lohstah on 22 Dec 2014, 17:16, edited 1 time in total.
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Re: Diamond Bass Comp

Postby lohstah » 22 Dec 2014, 17:14

Input and Optocoupler Stage. C26 and R31 are in reversed order.
R20 is hard to make out, R33 too.

Input and Opto Stage.jpg
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Re: Diamond Bass Comp

Postby lohstah » 22 Dec 2014, 17:16

EQ Output and LED stages. R6 and R37 hard to determine.

EQ Output LED.jpg
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Re: Diamond Bass Comp

Postby lohstah » 22 Dec 2014, 17:18

so, the last 4 question marks are the values of R6, R20, R33, R37.
maybe crackerman can have a look for us ? i marked them with green circles on the pic below so they are easy to find.

Resistors.jpg
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Re: Diamond Bass Comp

Postby Crackerman86 » 23 Dec 2014, 02:38

Top left: 100
Bottom left: 6.81K
Top right: 6.81K
Bottom right: 150K

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Re: Diamond Bass Comp

Postby lohstah » 28 Dec 2014, 17:20

the final schemo for the moment...values corrected by crackerman are in green.
i´m having doubts about R37. other than that, should be good to go. now somebody build it and confirm ;-)

BCP-Uno V1O1.jpg
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Re: Diamond Bass Comp

Postby Crackerman86 » 29 Dec 2014, 01:38

I did find a few things when I traced through this.
-There is a 1M resistor to Ground between C15 and R25
-C26 and R31 need swapped. The coupling caps tie together and the opamp is an in an Inverting configuration.
-On pin 2 of IC1A(LM358) there is a 100K resistor which goes to a .1u cap to Ground. Non-inverting circuit

I also tried to further investigate R37. It's: Brown Black Black Black Brown. It reads around 100 in circuit.
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