FET DI QUESTIONS

[BigSkyAudio]

Thanks Joe,
It turns out that the SS relay coil has gone open cct. so no switching occurring.
Relay replaced, voltages are good, and all now working fine,
Cheers, Neil.

[Joe Malone]

Thanks Joe,
It turns out that the SS relay coil has gone open cct. so no switching occurring.
Voltages are all good.
Can you supply a brand/part number for a replacement relay from Jaycar or Altronics?
Cheers, Neil.

HI Neil
ok that is unusual as the 24v coil can handle 48v. Altronics part S4132B 24v relay is a direct replacement.

[slb1959]

Hi Joe.
A friend ask me to make a Fet Di to a little 20v dc battery amp guitar.
It is possible to change the Di to do that, or i need a dc step up to do that?
She do not need the phantom power, neither xlr input.
Or, can i have the schematics to simulat that?

Thanks, Luís

[Joe Malone]

Hi Joe.
A friend ask me to make a Fet Di to a little 20v dc battery amp guitar.
It is possible to change the Di to do that, or i need a dc step up to do that?
She do not need the phantom power, neither xlr input.
Or, can i have the schematics to simulat that?

Thanks, Luís

Hi Luis
FETDI kit will run on 20v fine. The relay can be left off and 2 wire jumpers fitted where shown on the overlay so permanent DI input only.

[slb1959]

Hi Joe.
Something like that?

I sent to you one email.

Thanks.

[Joe Malone]

Hi Joe.
Something like that?

I sent to you one email.

Thanks.

Yes correct. I will get to emails tomorrow.

[caoimhin]

I’m going to build the fet di into its own dedicated 500 series module. Are there any changes i need to make to run it on the 16v standard rail?

The FetDI circuit will work fine across the +/-16v but the pcb 0v will be at -16v so will have to have a look at how to isolate that and reference the 500 series 0v +/-16v instead. If you do not understand what the above line means then let me know as I would have to have a think about it and draw up the best way to do it.

hi Joe - I foolishly got the FetDI rather than the FetDI500 for adding on to the BA500v2 I already have, and am wondering if it's possible to use it. I'm running the BA500v2 in a 51X rack, so have the 24V rails. Would just disconnecting the "-V" wire on the IDC cable work (Pin #6 going counterclockwise from Pin 1 with the arrow)? I'd then have 24V instead of 48V on Pin 5, and 0v on pins 7,8,9,10, if I understand correctly. Would that work?

[Joe Malone]

I’m going to build the fet di into its own dedicated 500 series module. Are there any changes i need to make to run it on the 16v standard rail?

The FetDI circuit will work fine across the +/-16v but the pcb 0v will be at -16v so will have to have a look at how to isolate that and reference the 500 series 0v +/-16v instead. If you do not understand what the above line means then let me know as I would have to have a think about it and draw up the best way to do it.

hi Joe - I foolishly got the FetDI rather than the FetDI500 for adding on to the BA500v2 I already have, and am wondering if it's possible to use it. I'm running the BA500v2 in a 51X rack, so have the 24V rails. Would just disconnecting the "-V" wire on the IDC cable work (Pin #6 going counterclockwise from Pin 1 with the arrow)? I'd then have 24V instead of 48V on Pin 5, and 0v on pins 7,8,9,10, if I understand correctly. Would that work?

This sound basically correct. I would have to go and look at the pin out again to be 100%. You will need to short out the 2k7 resistor on the fetDI in series with the relay coil so it will run on the 24v

[caoimhin]

Thanks, Joe, I'll give that a go a see how I get on.

Roughly trying to sketch the relevant part of the circuit - it's the 2k7 resistor below, right, and physically the one on the board closest to my rough sketch of the circuit?