Sansamp PSA Preamp - advice needed

[Grubb]

One of the important devices in my late teen period was the Sansamp PSA 1.1, which I really enjoyed using. I thought I would try and make a preamp pedal based on the schematic for the PSA 1:



My plan is to go from Input 1 through to the Volume output pot for my preamp pedal. Input 2 is omitted, as is the rest of the circuit. My questions:

1) Does this impact how I use IC1, which is partly dedicated to Input 2 in the original schematic?

2) Where would I look to work out how to draw the power section for my circuit? It needs to provide the ICs with +/- 5v or +/- 15v from a 9v supply.

PDF of schematic: https://www.dropbox.com/s/oh23cfbqdv6pz50/sansamp%20psa%201%20sch.pdf

[anotherjim]

Supply voltage needs verifying first - I don't know what that is.
Notice the "diodes" like D3/D4 on the opamp feedback. I suspect those are actually Zener diodes or it doesn't make sense. Their job is to limit the opamp gain to prevent those opamps from clipping. Only the TLC2272 amps in the super-secret section are allowed to clip.
So need to know the Zener voltages AND the power supply voltage since those interact.

[duck_arse]

U1 - U8 : TL072 --- +15/-15V
U9 - U10 : TLC2272 --- +5/-5V

[anotherjim]

Probably. TLCC227x max is 16v. 10v is a safe choice.

What about them feedback diodes on the TL07x chips?

[iainpunk]

What about them feedback diodes on the TL07x chips?

i bet they are zeners, or really leaky Germanium diodes.

cheers

[Vivek]

Would it be safe to assume that those feedback diodes are zeners

With value roughly of (Vcc/2) -2

?

[Grubb]

I appreciate the comments here, thank you.

I've found the thread (on another forum) where this schematic was originally posted: https://www.freestompboxes.org/viewtopic.php?t=25708

In the thread, the OP identifies the diodes as 4.7V 1N5230Bs. Hopefully that makes the schematic more decipherable for you.

Returning to my original questions, what should I do with the first IC, which has been partially dedicated to an input system I don't intend to use? And then there's the question of making 15v and 5v happen from a 9v supply 

Thanks again for the assistance.

[Vivek]

A Buck boost converter

Or 2

Might just be the ticket