[Available!] horstronic Buffmult 2.0

Ceri JC · Post by **Ceri JC** » Fri Aug 25, 2017 4:03 pm

Two for the UK, please. I've just sent you an email. Thanks in advance!

Finished building my first arcade button earlier this evening.

horstronic · Post by **horstronic** » Mon Aug 28, 2017 4:53 pm

All paid orders are shipped now.

Morphology · Post by **Morphology** » Mon Sep 11, 2017 4:03 pm

Hi, I was just building this, and just wanted to check something.

At this point on the circuit board, there is a 300 overlaid with what appears to be 1N5819. I am presuming it's a 300R resistor, and the 1N5819 is just some text left on the Silk Screen layer, but I just wanted to check?

Plus are there any calibration instructions? Do you just feed a voltage in, and adjust the trimmers until the output equals the input?

Does the order of the trimmers on the board match the order of the output sockets?

Morph

diablojoy · Post by **diablojoy** » Tue Sep 12, 2017 4:37 am

received in OZ

Morphology · Post by **Morphology** » Tue Sep 12, 2017 4:12 pm

Morphology wrote:Plus are there any calibration instructions? Do you just feed a voltage in, and adjust the trimmers until the output equals the input?

Does the order of the trimmers on the board match the order of the output sockets?

In answer to my second question - yes, they do.

In answer to my first question: I fed in a known, measured, voltage to the top input socket, then measured each of the 6 outputs and adjusted the corresponding trimmer until I measured exactly the same output voltage. I presume the calibration process is that simple,

Klangtueftler · Post by **Klangtueftler** » Sun Sep 17, 2017 12:35 am

I am late to the show

but are Buffed Mult 2.0 still available ?

KT · Post by KT » Mon Sep 18, 2017 6:58 am

I am also interested in two Buffmults 2.0. Still available?

horstronic · Post by **horstronic** » Mon Sep 18, 2017 1:56 pm

Morphology wrote:Hi, I was just building this, and just wanted to check something.

Sorry, I didn't see your post until now.

Morphology wrote: At this point on the circuit board, there is a 300 overlaid with what appears to be 1N5819. I am presuming it's a 300R resistor, and the 1N5819 is just some text left on the Silk Screen layer, but I just wanted to check?

Oops, sorry about that. You're right, it's a 300R resistor. Somehow the 1N5819 got two labels, and one happened to go over the resistor label.

About the calibration: Yes, you did it right. If you want to go really crazy you can also put 0V into the input, measure the outputs then to get the offset voltage and take that into account at the calibration process. The TL074 always has an offset of a few mV, so if you want to have a very precise Buffmult, you can do that.

Another way to make it really precise is this:
Connect the Buffmult input to a voltage source. Connect one lead of your multimeter to the voltage source too, connect the other one to the Buffmult output you want to calibrate. Your multimeter now shows the difference between the input and the output. You want to reduce that difference as much as you can of course. So you can now turn the trimmer until the difference is at 0V or just a few mV. Now start to change the input voltage. You can use a range of about -5V to +5V. The difference between the input and output should stay at the same voltage over the whole range, use the trimmer to achieve this.
This is how I calibrate it. It sounds a bit complicated and it's pretty hard to explain but once you get it, it's the most accurate and fastest method (as far as I know).

horstronic · Post by **horstronic** » Mon Sep 18, 2017 1:58 pm

Klangtueftler wrote:I am late to the show but are Buffed Mult 2.0 still available ?

Don't worry, it's still available.
Just write me an email to horstronic ät icloud dot com.
Please let me know your forum name and the country you live in so I can send you a PayPal invoice.

diablojoy · Post by **diablojoy** » Mon Oct 02, 2017 1:30 am

built all 4 - working good

I built 2 with the new boards and used 2 pin bicolor leds
in those
was wondering if there is a schematic available for the new version
as I was thinking of adding a small strip board for my 2 older boards
to add leds to them as well. no biggie though I can work it out if I have to.

horstronic · Post by **horstronic** » Wed Oct 04, 2017 4:58 am

diablojoy wrote:built all 4 - working good
I built 2 with the new boards and used 2 pin bicolor leds
in those
was wondering if there is a schematic available for the new version
as I was thinking of adding a small strip board for my 2 older boards
to add leds to them as well. no biggie though I can work it out if I have to.

Here's a quick render out of my PCB program.

diablojoy · Post by **diablojoy** » Thu Oct 05, 2017 2:25 am

awesome thanks for that

KT · Post by KT » Sun Oct 15, 2017 1:52 pm

Does anybody has a good source for the bicolor leds? Because these are bicolor leds with two legs? Never used them before, only those with three legs.
Thanks

diablojoy · Post by **diablojoy** » Wed Oct 18, 2017 3:13 am

Does anybody has a good source for the bicolor leds? Because these are bicolor leds with two legs?

I bought some off evilbay but synthrotek looks like they have them
http://store.synthrotek.com/3mm-LED--BiColor_p_491.html

horstronic · Post by **horstronic** » Wed Oct 18, 2017 6:15 am

diablojoy wrote:
Does anybody has a good source for the bicolor leds? Because these are bicolor leds with two legs?
I bought some off evilbay but synthrotek looks like they have them
http://store.synthrotek.com/3mm-LED--BiColor_p_491.html

I'm always using these:
https://www.reichelt.de/LEDs-Blink-Mult ... &OFFSET=16&

It used to be available at mouser too here:
http://www.mouser.de/ProductDetail/King ... 4VoYhAE%3d

Seems like it's obsolete now, but there are other color combinations still available.

KT · Post by KT » Wed Oct 18, 2017 9:07 am

thanks for the replies, I've found and ordered some from ebay

Schlumpfhut · Post by **Schlumpfhut** » Tue Oct 31, 2017 11:53 am

Hello everybody. After lurking arround the forum for some time i registered an account and would like to ask a question

Is it possible to adapt the PCB to an MOTM-style PSU?

I am looking into possibilities for a buffered multiple and yours are quite appealing to me

diablojoy · Post by **diablojoy** » Wed Nov 01, 2017 4:26 am

Is it possible to adapt the PCB to an MOTM-style PSU?

you are good to go actually
position for 4 pin MOTM power is there already
if you look at the pic of the board it uses the four larger holes overlaid on the
euro power header position

Schlumpfhut · Post by **Schlumpfhut** » Wed Nov 01, 2017 4:33 am

Thank you very much for the quick reply.

zenith · Post by **zenith** » Tue Feb 25, 2020 9:33 pm

Hello all! I am taking the plunge into building my first module and wanted to start with this buffered mult!

Are there any step-by-step walk-thrus I can study to reference on the way?

rsholmes · Post by **rsholmes** » Wed Feb 26, 2020 10:15 pm

There isn't, or at least none that I could find when I went to build mine.

It's pretty straightforward if you've built similar stuff before, but for your first module build, I'd definitely recommend considering something else. AI Synthesis has some very beginner friendly modules.

By the way, the current version of this PCB is designed to use either through hole or surface mount resistors and capacitors (vertically mounted through hole resistors). The Synthcube kit, for whatever reason, includes surface mount resistors and through hole capacitors. Not what I was expecting. I returned it and sourced the through hole parts myself.

zenith · Post by **zenith** » Tue Mar 03, 2020 9:22 pm

Thanks for the reply rsholmes! I may start with something easier then. It looks like there are components missing according to the BOM that were not shipped to me. I will likely start with something else in the meantime and try to source the resistors and other items.

rsholmes · Post by **rsholmes** » Wed Mar 04, 2020 12:33 am

Oh yeah, that was another thing with the SynthCube kit. There were parts added in the newer version of the module but they weren't included, basically it looks like they went by the old BOM with the new board. That was about a year ago and sounds like they still haven't fixed it.

zenith · Post by **zenith** » Wed Mar 04, 2020 4:45 pm

Pfft. Guess I'll just set my money on fire.

Schlumpfhut · Post by **Schlumpfhut** » Thu Mar 05, 2020 12:51 am

zenith wrote: ↑Wed Mar 04, 2020 4:45 pm Pfft. Guess I'll just set my money on fire.

Or you just buy the bare PCB and source the few parts yourself. Should all be found on Mouser or even Tayda

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[Available!] horstronic Buffmult 2.0

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