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DIY Buffered Splitter

ToneBum

Silver Supporting Member
Messages
498
I need one and don't want to buy a premade one since I'm going to put the circuit into an AB box with a buffered "tuner out". I've purchased one before from Austin over at ColdCraft but I'm not sure he's still offering these PCB's. So, can someone recommend a good buffered splitter PCB project that works well? Thanks!
 

jnepo1

Gold Supporting Member
Messages
15,477
AMZ is a member. If you don't believe me, then do a search for him and his website.
 

ToneBum

Silver Supporting Member
Messages
498
AMZ is a member. If you don't believe me, then do a search for him and his website.
I wasn't trying to say I didn't believe you. I just knew about AMZ already and wanted to know other options if they're out there.
 

SonicBoom

Member
Messages
732
I'm just finishing up one of these with a few mods of my own. I used two transformers from Encor that are flat out to 20KHz and can handle up to a 20V RMS signal. The xfmrs are a little overkill but at ~ $6, who cares. Besides, the only other options were xfmrs that were limited to 5V RMS or ones from Mouser with poor freq. response. They can be driven by an OPA2132 opamp that is powered by a charge pump run off of my PP2+. I plan to try it at +/- 9V and go to +/- 18V if I need more headroom.

My board is stereo, so the unit has two separate channels that can be independently switched true bypass. When engaged, each channel can be set to active (run through the op amp buffer) or passive (straight from input to xfmr). Passive is more like a direct box and would be used in cases where the previous pedal is buffered.

Looking fwd. to testing it out.
 
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DieHon

Member
Messages
549
There is a free schematic for a jfet splitter on my web site at http://www.muzique.com/lab/splitter.htm

The Opamp Multi pcb can make a dual output buffer if you prefer a pcb and/or opamp.

Best regards, Jack
It's an old thread, I know, but I need to thank you for this amazing work and ask you a question: do I need to make any change in this schematic to use it with line level (+4dB) devices? I want to split my amps fx loop.
 

amz-fx

Silver Supporting Member
Messages
1,763
It's an old thread, I know, but I need to thank you for this amazing work and ask you a question: do I need to make any change in this schematic to use it with line level (+4dB) devices? I want to split my amps fx loop.
You probably need to power it with more than 9v for clean operation with +4db devices.

+4dbu = 3.47v pk-pk but you want some headroom above that, which makes it marginal on 9v, so I would power it with 18v, or at least 12v.

Best regards, Jack
 

DieHon

Member
Messages
549
You probably need to power it with more than 9v for clean operation with +4db devices.

+4dbu = 3.47v pk-pk but you want some headroom above that, which makes it marginal on 9v, so I would power it with 18v, or at least 12v.

Best regards, Jack
Great!

The idea is to split the amp fx send into 3 signals. Two would go to the input of two line level rack fx and the other would be the dry signal. This would make a parallel routing with the dry signal pure. However, how can I sum the outputs? Just solder everything into a single jack?

Thanks for your help!
 






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