I am making some of the Resonant Lopass Gate (RLPG) circuit boards available again. I need to replace some that we're sadly lost in the shipments for the last batch and to replace my personal board stock for my own projects. I have received interest for additional boards recently so I will be taking orders to include extra boards in this replacement order.
If you want boards, please PayPal $15 per board to email@example.com with "RLPG Order" in the subject line and I'll note your order. This cost per board includes shipping (global) via USPS. I always replace any boards lost in shipping, hence this order.
This board is the latest revision, but I will fix the IC ground issue in the mixer section thereby eliminating the need for the kludge to fix the board. Board orders are being accepted from now until May 13th with the new board order being placed on Monday the 14th. Boards take 2 weeks to arrive so orders won't start shipping until the week of May 28th. I know this delays delivery, but I order boards to demand and this method has worked well in the past.
I hope you find the news that I am making this limited run of Resonant Lopass Gate boards available to be good news. This project is a fun one and people from beginners to experts have enjoyed it. Please contact me with any questions or feedback directly at firstname.lastname@example.org
I have made a page dedicated to the 2nd run of boards and it has pictures, document packet, and other information all in one place. There is a PayPal cart to buy boards.
Current ETA on arrival of next batch/ship date is mid-June. Buy now so I know how many you need in advance of placing the order next week. Thanks!
older posting info...
I just got the approval from Don himself to put together second PCB run for the Mathias (Fonik)-based PCB layout of Don's classic Lopass Gate. The PCB has been modified to include the very functional resonance mod and a "deep" switch to adjust the offset range with one extra resistor in the circuit. The module features the classic features of:
1 single Lopass Gate section including...
Resonance Pot (NEW feature)
Mode switch (Filter/Both/Amplitude)
Deep Switch (NEW feature)
It's DIY, so you can use any set of single Vactrol's you'd like (slow, fast, whatever... but not tested with CLM6000 or others. Vactec only so far on my prototypes)
PCB's will be double sided, solder masked with silk screen from PCB Express. Please reply to this if you are interested in this project so I can gauge the interest-level. I know there are other pre-assembled Lopass gates out there , but no one offers a PCB. My hope is that this run will fill that gap and get more people making vactrol music.
More information to come sooner rather than later guys. Remember, I'll do the best I can between work, school, wife and still maintaining my own builds. Hey, gotta say it now before things get rolling right?
PS. I'm a first timer with posting like this on electro-music. Please contact me if I am missing something related to proper following of the rules (Privately please)[/size][/color]
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Posted: Sat Sep 20, 2008 4:13 am Post subject:
Re: Buchla "292c Resonant" Lopass Gate PCB Project-Intereste Subject description: With permission from Don himself
I am looking for the following information from people who have built this PCB design from Fonik's "Buchlaesque" modular page:
1. Does it run on +/-12v? I only have +/-15v and cannot test this
2. Would you want a Euro power connector on it if possible with 12v? What if it only runs on 15v?
I have Fonik LPGS running on 15V and on 12V ( in the same DIY Cabinet )
That works fine. There where no obvious Gain differences noticable for me
Fonik mentioned that i can adjust the Gain with R14 ( refering to the Grenader layout found at Foniks site )
Just make this as a Trimmer. I have done it so on my proto, but never checked trimming .
The outputgain on the LPG is IMO anyway a bit low, especially as it has no Headroom and distorts quick and bad.
So Gaintrimming is anyway a very useful thing.
If you have mods, submit them to me now and I'll do my best to take them into consideration for inclusion on the board. "Jumper-based" mods aka optional ones are best. I'll be putting together a simple build doc for this to include with PCB's.
beside the Trimmer for Gain,
please give the option to have up to three CV inputs.
On my prototype i just multipled C5,R4 and R5 .
Fonik mentioned that he would not make C5 and R4 anymore.
Serenadi had the circuit on the Breadboard and explained the behave of that parts on a german thread.
Seems really not neccessary.
On my proto, C5 and R4 is not populated on CV inputs two and three.
It works fine.
Please, several CV Inputs are very useful !!
The option to have two audio inputs is also cool. Not shure if a simple solution works.
( I added a OPAmp summing stage on my LPG proto. )
i have several Fonik LPGs and one modified one with the options, the modified is much much better to patch with.
Much better possibilitys to work with Sequenzes !
But ofcourse you don't need those options if you just patch FM over a LPG to a Filter or VCO. But one can build several LPGs
good to have the options, really !
please draw the Board that one can solder connectors into.
think to keep 0.15" or 0.2" and not only 0.1", between connectors
thanks for the project.
Not shure yet if i need some
i am in for two (2!), please. it's great you made this happen, thomas. i never wanted to do a run of manufactured PCBs because i know there are still people making money from the circuit i used. but now with permission of db himself...
BTW i liked to have additional euro power connectors on the PCB (there is plenty of room anyway). i see no reason why this should not work under 12V, 9V or whatever. one would probably have to lower the value of R3 (in my schematic). i myself am using ribbon connectors for the power bus, and i am powering all the modules with 15V - that's my standard
concerning the resonance: serenadi observed a selfoscillation of the opamp in the resonance path at a certain position of the potentiometer and in combination with a certain vactrol. he suggested to put a 33pF cap between pins 12 and 14 of this opamp to prevent the oscillation.
the option for a 2nd CV in would be great, i think (AM!?). _________________
Joined: Mar 14, 2007 Posts: 281 Location: new mexico
Audio files: 2
Posted: Sat Sep 20, 2008 6:50 am Post subject:
2 for me please. Love the resonance - it sounds different than Doepfer's implementation.
I will probably mod mine with switches to have at least 2 choices of Vactrols each including the NSL-32 for different response curves without having to have 4 separate modules. I love vactrol filters. Thanks so much for the offer!
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