Search found 196 matches

by emuarc
Sat Nov 21, 2020 5:58 pm
Forum: Eurorack Modules
Topic: Behringer System 55
Replies: 1051
Views: 57273

Re: Behringer System 55

The Behringer CP3A-M is actually a CP3 module, all transistor design from the IIIP. It will slew any signal below -6v, also makes for lovely distortion. Great for audio but not so good for CVs. The CP3 has a high cut filter which I have added to the Behringer with a toggle switch. To get a true CP3A...
by emuarc
Tue Nov 17, 2020 3:12 pm
Forum: AMSynths
Topic: ARP 2500 modules by Behringer - engineered by Amsynths
Replies: 2
Views: 410

Re: ARP 2500 modules by Behringer - engineered by Amsynths

I couldn’t say much in August due to NDA, but very pleased to see the 2500 modules getting to customers. The basic modules are released first and then then the more complex modules. The 1005 is a very flexible module for creating ring mod sounds and both filters have a very clear quality. The Env ge...
by emuarc
Tue Nov 17, 2020 3:04 pm
Forum: AMSynths
Topic: AM993 moog-ish modules
Replies: 1
Views: 82

Re: AM993 moog-ish modules

Hi The 993 connects to 902, 911, 911A Daughter PCBs and the 904C connects to a 904A Daughter PCB which is also used with the 904B. That part was easy as none of the jack sockets are normalised. The 993 inputs are wired to a 994 Multi. Next step is to pre patch the CP3A-O, 921A and 921B. This probabl...
by emuarc
Sun Nov 08, 2020 4:25 pm
Forum: Eurorack Modules
Topic: Behringer System 55
Replies: 1051
Views: 57273

Re: Behringer System 55

The AMSynths AM904A Daughter board replaces the Behringer filter caps with larger value polypropylene,matched caps, to recreate the Moog IIIP 1967 low pass filter. The filter resonance has improved, with resonance down to 40Hz and a 3rd harmonic in self oscillation, low end response has also improve...
by emuarc
Tue Nov 03, 2020 4:19 pm
Forum: Eurorack Modules
Topic: Behringer System 55
Replies: 1051
Views: 57273

Re: Behringer System 55

The AMSynths 993 module is up and running, with LEDs in the 911’s, no patch cables here...904C and 984 next

Image
by emuarc
Wed Oct 28, 2020 4:29 pm
Forum: Eurorack Modules
Topic: Behringer System 55
Replies: 1051
Views: 57273

Re: Behringer System 55

Hi, The stock 914 does sound very good and the SMD caps in the upper frequencies are fine, not harsh. The next level up is matched polypro and polystyrene caps, maybe with OPA4134’s. To do polystyrene caps in the HF bands really means a new PCB and some careful meaurement of the SMD values, although...
by emuarc
Thu Oct 08, 2020 8:58 am
Forum: Eurorack Modules
Topic: Behringer System 55
Replies: 1051
Views: 57273

Re: Behringer System 55

Hi, I have modified my 904B with matched 680nF polypropylene capacitors in the low range, and a pair of 180nF + 220nF polypropylene capacitors in parallel for the high range. Its a tight fit to get all the caps in, and the 180nF are mounted on the rear of the PCB. I like the sound.  My 904A has new ...
by emuarc
Tue Oct 06, 2020 8:37 am
Forum: Eurorack Modules
Topic: Behringer System 55
Replies: 1051
Views: 57273

Re: Behringer System 55

I have fitted the Alpha C50K to the 923 and they are an improvement, I also found some nice 14mm diameter knobs on Mouser. I have Bourns 1MA and 5KB on order and will test at the weekend on 911, 911A and 921B. The original Moog 921B schematic (not the 921) shows an unknown resistor R8 in parallel to...
by emuarc
Mon Sep 21, 2020 12:48 pm
Forum: Eurorack Modules
Topic: Behringer System 55
Replies: 1051
Views: 57273

Re: Behringer System 55

The tempco is close enough to the 3046 to not be concerned about thermal drift. The 3046 is not heated and this is all smd in a small pcb. Adding a thermal paste might help but I see no evidence to do this. It tracks fine. Sorry Rob. The data shared here doesn't back what you wrote. If it were fine...
by emuarc
Sun Sep 20, 2020 4:42 pm
Forum: Eurorack Modules
Topic: Behringer System 55
Replies: 1051
Views: 57273

Re: Behringer System 55

The tempco is close enough to the 3046 to not be concerned about thermal drift. The 3046 is not heated and this is all smd in a small pcb. Adding a thermal paste might help but I see no evidence to do this. It tracks fine. Its more of an issue if the wrong tempco was used or no tempco in the 112. A ...
by emuarc
Wed Sep 09, 2020 12:16 pm
Forum: Eurorack Modules
Topic: Behringer System 55
Replies: 1051
Views: 57273

Re: Behringer System 55

Hi, the 923 does have reverse log pots, but Moog used steeper tapers and larger diameter pots back in the 1960’s. Behringer couldnt do a custom pot, unfortunately. Putting a resistor in series may create the right resolution at near max settings. I will try this 😊😊
by emuarc
Wed Sep 02, 2020 3:24 pm
Forum: Eurorack Modules
Topic: Behringer System 55
Replies: 1051
Views: 57273

Re: Behringer System 55

A quick update on my B55 mods and additional modules; 993 Trigger And Envelope Controller - prototype is being tested and the internal patching to the 911’s, 911A, 902’s looks possible without removing any jack sockets from the Behringer modules as they are not normalised. Pictures soon, my panel ma...
by emuarc
Mon Aug 24, 2020 9:54 am
Forum: Eurorack Modules
Topic: Behringer System 55
Replies: 1051
Views: 57273

Re: Behringer System 55

yep! Edited- thanks..
by emuarc
Mon Aug 24, 2020 6:02 am
Forum: Eurorack Modules
Topic: Behringer System 55
Replies: 1051
Views: 57273

Re: Behringer System 55

Hi, If you are building up a System 55 or IIIP using the B55 modules you might notice some missing modules; the 993, 904C and 928. At AMSynths I am making these for my Klaus Schulze IIIP replica, and the test panel for the 993 Envelope Controller is attached. If there is enough interest, I can make ...
by emuarc
Tue Jun 02, 2020 2:24 pm
Forum: AMSynths
Topic: Future Plans
Replies: 25
Views: 10051

Re: Future Plans

Hi, One of the objectives of the Behringer collaboration is to bring an amazing set of euro rack modules, at large production volumes. Something that AMSynths could not do alone. We are a few weeks away from launch and we hope our customers will no longer be frustrated in the web store being out of ...
by emuarc
Tue Apr 21, 2020 8:06 am
Forum: Music Tech DIY
Topic: New Sound Semi parts
Replies: 52
Views: 4529

Re: New Sound Semi parts

Hi Very exciting news as this brings an Audity replica closer to being made, especially as I have the schematics! The VCO’s are discrete but the LFO is 2030, the LP and HP are 2040. The resonant filter can be done with the 2164 as can the VCA’s. The envelope generator will have to be a CEM3310 or di...
by emuarc
Tue Sep 24, 2019 2:17 pm
Forum: Music Tech DIY
Topic: Roland System 700 DIY VCO
Replies: 61
Views: 20528

eBay or UTsource
I can send them to you for free if it’s a small order
Drop me an email at sales@amsynths.co.uk

I must get my 702 working ☺️☺️
by emuarc
Sun May 12, 2019 12:25 pm
Forum: AMSynths
Topic: JP8 Filter
Replies: 88
Views: 19634

10x 8109 JP8 filters will be shipping in 10 days, drop me an email at sales@amsynths.co.uk to preorder. The 8328 filter module is in stock now, for anyone wanting a CEM3328 low pass filter.
by emuarc
Thu May 09, 2019 2:23 pm
Forum: Music Tech DIY
Topic: The open source Jupiter-8-4-ALL project
Replies: 88
Views: 11143

Very cool using the 3310 as a basis. How did you use the modulation input to vary the timing? I was aiming to get the replica into a 16 pin footprint...
by emuarc
Thu May 09, 2019 5:47 am
Forum: Music Tech DIY
Topic: The open source Jupiter-8-4-ALL project
Replies: 88
Views: 11143

Hi, I have started researching the IR3R01 envelope chip in more detail, and there is a post on my website to record progress to a working replica here: https://amsynths.co.uk/2019/05/09/roland-ir3r01-clone/ . If anyone has ideas or real world measurements please comment on the post or here. My initi...
by emuarc
Fri Apr 12, 2019 6:43 am
Forum: Music Tech DIY
Topic: who can clone arp 2500 "wing" cab size system
Replies: 83
Views: 7459

The design files are being loaded into Github so anyone can have panels and PCBs manufactured, as they are licensed as open source. There are few restrictions and there is no warranty or liability
by emuarc
Thu Apr 11, 2019 10:57 am
Forum: Music Tech DIY
Topic: who can clone arp 2500 "wing" cab size system
Replies: 83
Views: 7459

Time for a progress update on my ARP 2500 replica! It is now an Open Source Hardware project with files being loaded into my Github repo and there is a progress update on every module here: https://amsynths.co.uk/home/my-synths/2500-rack/ Latest module is the 1047, and here is the front panel: https...
by emuarc
Tue Apr 02, 2019 1:38 pm
Forum: AMSynths
Topic: JP8 Filter
Replies: 88
Views: 19634

Thanks for the positive feedback and another batch of 10x 8109 modules are being built in April.
by emuarc
Sun Mar 17, 2019 4:14 am
Forum: AMSynths
Topic: AM8320 panel - any new stock soon ?
Replies: 2
Views: 1230

Hi,
Panels will be in stock at end of March and I will put the CAD file in the manuals section of the web site.
by emuarc
Sun Mar 17, 2019 4:10 am
Forum: AMSynths
Topic: JP8 Filter
Replies: 88
Views: 19634

Hi
Possible cause is the M5210 switching op amp that takes the 12 and 24db outputs from the IR3109. Its a SIP chip. I can send you a repalcement for free just drop an email to sales@amsynths.co.uk

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