Messages

Cool. I am looking forward to seeing how everyone tackles this build.

Hello folks


all PCBs are now spoken for. Thankyou for those who supported that, helps me cover the costs of doing about 8 PCBs on this (!)

I wanted to let you know that I made a rev with a SMD footprint for the LM13700 - so I can confirm that SMD part will work (obviously, with the rev in your hands you would need an adaptor PCB, but it will be viable).

Cheers

Howdy

Thanks for the nice message. I appreciate it a lot.

My bad for any errors. Ive updated the first page now.

As for missing caps let me know specifically what I have mis-labelled there. thanks

It does jump from C21 to C28 with nothing in between

C28 is added to C19 in parallel. The original part of that filter schematic is not on the original MS (hence the bypass toggle) and is indeed lifted ffrom Aleph Null via a datasheet for a PT2399 delay. Is a multiple feedback Low pass filter. The freuqency can be adjusted via C19 - if you want you can just put a 680pF or whatever your preference is up to about 1.5nF ish and forget C28. I found the 680pF can be a tad limited with bass, its grand with guitar. Hence you can mess around. The pads for C28 could also be used to switch in other caps ?

This was hopefully mostly captured in my build notes, towards the end of the BOM doc

"C19 and C29 are in parallel, and approximate a 680p cap. I found it useful try one cap depending on the tone you prefer. Lower (total) values of C19 and C29 will give "peakier" and harsher treble sounds. Higher values will darken the filter. Try anything from 220p up to 2n2 in total. You can simply put a 680pf cap in either position and call it a day 😊"

R7 is 27k

As for the wierd values, its what the schematic called for I guess

Cheers

All boards ordered posted. 1 left.

replied. 2 left

Yeah totally wild.

Im tempted to even post it up in the Gig Rig facebook lol see what they make of it

I had to reply and say I suggest he buys a GigRig G3, and even that might not do everything required (!)

Heres mine....
How would you approach that?!

"I would be interested in a pedal featuring:

 • 1x mono/stereo line input

 • 6x mono/stereo Sends with Level control for each one of them (if possible I'd like to also have a tunable HPF before each Send)

 • 6x mono/stereo Returns with Level control for each one of them

 • Phase reverse switch for every Return

 • Soft-touch (click-free) footswitches to Mute/Un-mute the returns

 • Dry blend control knob

 • Master level control knob with boost capability (+18dB)

 • Pan(L/R) knob for the output

 • 1x stereo line output with isolation in both channels

 • 2 x XLR outputs (for L & R) possibly with optional 20dB attenuation switch and ground lifts for both XLRs

 • Buffered inputs & outputs

 • Flat response in the whole 20Hz-20kHz range

 • I need the device to be able to handle eurorack signals (at least 10Vpp) and even higher if possible (20Vpp)"

If anyone is up for the challenge let me know
Also, use the thread to share your wildest requests?

Cheers,
Ian 

Still a couple unspoken for - I have PM you Bret.
Cheers

PMs sent to interested parties.

Im debating selling some spare PCBs from the run.
I wouldnt be providing a full build doc, moreso a basic BOM and a drill template for Tayda drilling.
 The PCBs were fabbed with 2 daughter PCB boards for 3PDT true bypass (you only need one, so there is a spare).

I would like to ask £12 GBP for each of these, shipped worldwide. Drop me a line at info@gigaheartsfx.com if this sounds reasonable

here is a proper janky demo on a bass, side by side a real EHX big box BMS - I think they sound remarkably similar if not identical.
The filter is a tad lossy; there is a trim pot on board to balance the outputs when engaged vs disengaged.

How about this:

https://www.allaboutcircuits.com/video-tutorials/op-amps-low-pass-and-high-pass-active-filters/

http://sim.okawa-denshi.jp/en/OPseikiLowkeisan.htm
http://sim.okawa-denshi.jp/en/OPseikiHikeisan.htm

Dude! Legendary. This works/worked perfectly to simulate the original circuit.
Im working on adjusting values now. Cheers