Diamond Bass Comp

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Re: Diamond Bass Comp

Postby lohstah » 02 Jan 2015, 12:09

1M to ground after C15, true, added.
100K to .1µ blocking cap to ground after 47K5, true, added.
rest around LM358 should be as i have drawn, extra resistor crackerman mentioned is that 47K5 from 2 to 1 of opamp.
C26 and R31 swapped, i mentioned that above, but left the schematic as was, order of those 2 components should not make a difference ?
that resistor which is still puzzling is R37 and the reading seems weird, on guitar version is 1K5. maybe 4th ring is brown, meaning 1K, or first ring is grey, meaning 800R ?

updated schematic V1.2:

BCP-Uno V1O2.jpg
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Crackerman86 (04 Jan 2015, 04:10), daemons (01 Sep 2015, 14:32), Duckman (02 Jan 2015, 17:46), Jopn (07 Jan 2015, 01:11), jsaily (19 Jan 2015, 11:52), nachoc (15 Mar 2016, 08:55), Pokfor (17 Nov 2017, 12:21), raydee (05 Aug 2016, 20:21), rock soderstrom (03 Jan 2015, 02:06), tp801 (02 Jan 2015, 19:06)
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Re: Diamond Bass Comp

Postby lohstah » 02 Jan 2015, 12:13

Bottom Traced Out.jpg
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Re: Diamond Bass Comp

Postby Crackerman86 » 04 Jan 2015, 04:17

I built one modifying harald's vero. Everything is as on the schematic except I didn't change the red led section from the guitar version. Back to back I can't hear a difference to the stock one I have. I also can't see a diffence between the leds. I wish I had an answer for R37.
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Re: Diamond Bass Comp

Postby awallace » 15 Jan 2015, 16:52

Crackerman86 wrote: I wish I had an answer for R37.


R37 = 10k

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Re: Diamond Bass Comp

Postby jsaily » 19 Jan 2015, 20:06

I'll build one of these as well. I'm quite happy with the Forest Green Compressor clone but you can never have too many ;-) I have some NSL-32 optos and a few roll-your-own LED+LDRs I tried in the FGC before the NSL-32. It seems that the original VTL5C3 vactrols are almost obsolete or very highly priced.

The potentiometer values are not shown in the schematic, I assume they are identical to the guitar version?
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Re: Diamond Bass Comp

Postby Crackerman86 » 26 Jan 2015, 14:57

jsaily wrote:The potentiometer values are not shown in the schematic, I assume they are identical to the guitar version?


Exactly. Yes they are

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Re: Diamond Bass Comp

Postby jsaily » 30 Jan 2015, 12:18

My unit is now completed and works nicely! I used an NSL-32 optocoupler, OPA2134, LM358, all 2N3904 BJTs, polyester and ceramic caps, 1% metal film resistors. The Sabrotone Diamond Compressor vero layout was easily modified for the bass compressor because there is enough space. Thanks a lot for tracing this excellent pedal!
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Re: Diamond Bass Comp

Postby lohstah » 31 Jan 2015, 11:09

great ! did you use a dual red/green led ? what value did you use for R37 ?
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Re: Diamond Bass Comp

Postby jsaily » 31 Jan 2015, 16:32

lohstah wrote:great ! did you use a dual red/green led ? what value did you use for R37 ?


I had a tri-colour led (red, green, blue) and wired up the correct cathodes ;-) R37 was 10k. The red led is quite bright but I guess it's designed that way. Green lights up when its compressing.
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Re: Diamond Bass Comp

Postby daemons » 01 Sep 2015, 06:14

Hello,

Is there a final version of the schematic available for the bass comp?

I tried to build a Bill of Material for the bass version, based on the guitar version and I noticed what might be some 'rounding' in the values?
I realize some resistor values probably don't matter much if they're 1% or not, but since I'm at it.. I figure I might as well do it right.

Can someone verify if these are correct, and answer where I have "or" written to confirm which value it's supposed to be?

    Parts List:

    Capacitors
    Caps 2u2 and higher are electrolytic. C22/23/30/31/33 are ceramic, all other film
    C1 220u
    C2 47u
    C3 47u
    C4 4n7
    C5 4n7
    C6 4u7 Polarity?
    C7 100n
    C8 4u7 Polarity?
    C9 100p
    C10 820p
    C11 100p
    C12 820p
    C13 2u2 Polarity?
    C14 100p
    C15 4u7 Polarity?
    C16 820p
    C17 100n
    C18 820p
    C19 10n
    C20 10n
    C21 2u2
    C22 100n
    C23 100n
    C24 820p
    C25 3n3
    C26 15n
    C27 15n
    C28 4u7
    C29 3n3
    C30 100n
    C31 100n
    C33 100n
    C34 15n (Switch C4)
    C35 15n (Switch C5)
    C36 100n (connected to R43)

    Resistors
    All metal film 1% except R1 which is carbon film 5%
    R1 100R
    R2 10K5
    R3 10K5
    R4 100R
    R5 15K
    R6 6k81
    R7 22.1K or 22K ?
    R9 15K
    R10 47.5K
    R11 47.5K
    R12 47.5K
    R13 47.5K
    R15 1M
    R16 475R
    R17 475K
    R18 475K or 470K ?
    R19 4K7
    R20 6k81
    R21* 1M (connected to C15)
    R22 100R
    R23 475K or 470K ?
    R24 22.1K or 22K ?
    R25 100K
    R26 1K
    R27 3.32K or 3K3 ?
    R28 475R or 470R ?
    R29 221K or 220K ?
    R30 475K or 470K ?
    R31 100K
    R32 221K or 220K ?
    R33 150K
    R34 475K or 470K ?
    R35 470K or 475K?
    R36 10K
    R37 100R
    R38 10K
    R39 Jumper
    R40 10K
    R42 47k5 (pin 1 & 2 IC1A)
    R43 100K (pin 2 IC1A to C36)

    Transistors
    Q1,Q3 MPSA18
    Q2, Q4, Q8-9 2N5088
    Q5-7 2N4401

    IC1 LM358AN
    IC2 OP275
    LDR1 VTL5C3

    D1, D3-D9 1N4148
    D2 1N4004
    LD1 5mm Bi-colour Red/Green Common Anode LED.

    Pots
    Comp A100K
    EQ B50K
    Vol B100K

Hopefully I haven't forgotten anything.

Looking forward to making a PCB for this one.

Dae.
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Re: Diamond Bass Comp

Postby lohstah » 02 Sep 2015, 20:33

V1.2 above is the latest and final version, crackerman used it to build a working clone, read his post above.
only question left was R37. but it is only in the status-led section and will not influence the sound. crackerman used the value of the guitar version for R37.

cheers,
lohstah
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Re: Diamond Bass Comp

Postby daemons » 03 Sep 2015, 14:16

lohstah wrote:V1.2 above is the latest and final version, crackerman used it to build a working clone, read his post above.
only question left was R37. but it is only in the status-led section and will not influence the sound. crackerman used the value of the guitar version for R37.

Ok but crackerman built using a modified Sabro vero, using these values, correct?
So all values on the v1.2 schematic have been verified? In particular R28... To me it looks exactly the same as R16 - 475R, used in the same way.

Is it just me or is the whole section for the green led (Q9,R40) kinda redundant? Couldn't just a single resistor do the same job, or am I missing something?

I assume the 4401s can be replaced by 3904s without any issue?

The schematic doesn't show the polarity for C6,C8,C13 & C15. I will need to make a schematic in order to make a PCB. If you like, I can post my finished schematic once I'm done.

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Re: Diamond Bass Comp

Postby lohstah » 11 Mar 2016, 09:46

ok folks, a little update.
i got another one in, and revisited those 4 resistors that were bugging us. they are definitely the values that crackerman posted.
6K81, 6K81, 150K and 100R.
yes, R37 is 100R. brown, black, black , black. and measures 100R as well.

cheers,
lohstah
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Re: Diamond Bass Comp

Postby awallace » 11 Mar 2016, 20:15

lohstah wrote:ok folks, a little update.
i got another one in, and revisited those 4 resistors that were bugging us. they are definitely the values that crackerman posted.
6K81, 6K81, 150K and 100R.
yes, R37 is 100R. brown, black, black , black. and measures 100R as well.

cheers,
lohstah


R37 is (or should be) 10k... assuming you mean R37 as marked on the PCB. Did you remove it or measure it in circuit?

jsaily wrote:Green lights up when its compressing.


Green is always on. Red should light up when it's compressing.
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Re: Diamond Bass Comp

Postby lohstah » 12 Mar 2016, 15:22

Code: Select all
assuming you mean R37 as marked on the PCB


no, R37 in the schematic.
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Re: Diamond Bass Comp

Postby nachoc » 15 Mar 2016, 08:54

Hi all!

I'm new to the forum, where I landed looking for quality schematics for bass effects. I came across the Diamond Compressor because my teacher has it, but it's way to expensive for me. I followed carefully all the posts in this topic trying to assess if this project is doable by me, so far I think it is :D
I tried to implement the modifications in the sabro vero by following the v 1.2 schematic, and I came up with this:
DiamondBassCompmodified.pdf

It's been a long time since college, so I'm a bit rusty in complex circuits. I tried to separate the parts, so orange is for power, yellow for compression net, and pink for eq section (more or less i think so).
I didn't think it was easy to modify but I took the challenge. The modifications I've made include the 1Mohm resistor to ground in series with C25, the 47k5Ohm resistor in series with the 0.1 F capacitor on IC1A, the inclusion of C2, as well as the 15nF capacitors in parallell with C4 and C5.
I don't see any elegant way of including the 1N4004 diode in the power section without adding a extra column to the vero.
I would apreciate if any of the builders find time to take a look to the file and feel free to make suggestions. I would like to produce a better vero model entirely adapted to bass, since is not easy to find quality bass stuff out there.
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Re: Diamond Bass Comp

Postby Crackerman86 » 25 Jul 2017, 15:04

Found this online. The bass version is mostly correct. Q3 should be a MPSA18. Maybe a thing, or two else is wrong.

http://lectric-fx.com/product/zirconia- ... sor-v-1-1/
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Re: Diamond Bass Comp

Postby Crackerman86 » 25 Jul 2017, 17:00

lohstah wrote:ok folks, a little update.
i got another one in, and revisited those 4 resistors that were bugging us. they are definitely the values that crackerman posted.
6K81, 6K81, 150K and 100R.
yes, R37 is 100R. brown, black, black , black. and measures 100R as well.

cheers,
lohstah


Who doubted me!!! Just kidding. Sorry that I haven't been on in awhile..school has been killer.

I rounded up the differences with the diamond, and lectric-fx pcb:
Q3 should be another MPSA18, Q4 should be a 2N5088, Q5/Q6/Q7 should be 2N4401, a 1M ohm resistor to ground needs added between C15-R25, IC1.1 needs to be modified to have 47.5k ohms between 2-1, 100k ohms from 2 to a 0.1u capacitor to ground (non-inverting gain of 1+ rf/ri -> 1+0.5).

Another thing is that the maker entirely omitted the bicolor LED ckt. It would still save someone hours, and hours....

I emailed the maker the differences. We’ll see what they say.
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Re: Diamond Bass Comp

Postby Pokfor » 06 Mar 2018, 06:25

My job.
Comp_1.jpg

Comp_2.jpg

PCB File
Diamond Bass Comp.zip

The case was used from here https://www.taydaelectronics.com/hardwa ... osure.html
Signal capacitors WIMA FKP2 and MP4
There are some deviations from the scheme published here. R6 (6k8 according to the scheme) used 100k, because the green LED was much brighter than red and the operation indication was not correct. C26 and R31 are interchanged. There are still large deviations in the supply chain. All this can be seen on the board file.

Моя работа на русскоязычном форуме вот тут http://guitar-gear.ru/forum/topic/5975- ... ompressor/
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Re: Diamond Bass Comp

Postby plush » 15 May 2018, 11:01

Oh, guess I'll have to share my build too :D

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