Preamp inside a delay

[electromerca]

Hello guys!

I would like to know if it's possible to attach a preamp PCB to a delay PCB..

I have a delay which I would like to have the chance to plug a microphone into it if I press the switch, passing through a preamp:


INPUT -> is it a microphone? ->YES -> PRE AMP -> DELAY -> OUT
                                            ->NO  ---------------->DELAY -> OUT

Do you know if this is possible?

Thank you very much!

[midwayfair]

Need to know what kind of preamp we're talking about and what kind of delay you want to make. Of course it's possible, but depending on what your needs are it might not necessarily be advisable, like if the preamp is spitting out a 24V p-p signal that would overdrive most delays.

[electromerca]

Need to know what kind of preamp we're talking about and what kind of delay you want to make. Of course it's possible, but depending on what your needs are it might not necessarily be advisable, like if the preamp is spitting out a 24V p-p signal that would overdrive most delays.

The delay is an Aquaboy DX

Not sure which preamp should I consider, INA217? You know better!

[PRR]

You have wire. You can connect anything to anything.

For the rig you describe, you would normally use two jacks. One for microphone. The output of the preamp goes to a 1/4" Switching Jack's switch leg. If nothing is in the jack, signal passes to the Aquaboy. If a guitar (or pedalboard output) is plugged to the 1/4" jack, it breaks the connection from the mike preamp and feeds the gitar directly to this Aquaboy.

[ashcat_lt]

You have wire. You can connect anything to anything.

For the rig you describe, you would normally use two jacks. One for microphone. The output of the preamp goes to a 1/4" Switching Jack's switch leg. If nothing is in the jack, signal passes to the Aquaboy. If a guitar (or pedalboard output) is plugged to the 1/4" jack, it breaks the connection from the mike preamp and feeds the gitar directly to this Aquaboy.

This is a great idea! 

I was going to say that your delay probably has a buffer at the front which could be switched to actually apply gain, but I think you'd need a fancier jack to have it switch automagically.

[electromerca]

You have wire. You can connect anything to anything.

For the rig you describe, you would normally use two jacks. One for microphone. The output of the preamp goes to a 1/4" Switching Jack's switch leg. If nothing is in the jack, signal passes to the Aquaboy. If a guitar (or pedalboard output) is plugged to the 1/4" jack, it breaks the connection from the mike preamp and feeds the gitar directly to this Aquaboy.

Wow!! thank you so much

One thing that concerns me, though, is that the INA 217 operates at 18v, while the Aquaboy does it at 9v (the v3205 version)

So for what I've been studying, should I need to drop some voltage before going from the Preamp to the Delay?

And a last question comes to my mind as I type this..

What would happen if the preamp uses 9v as well as the delay? I mean, if I go to the pre -> delay, wouldn't those first 9v drop from the preamp to the delay? Should I care for that?

[ashcat_lt]

One thing that concerns me, though, is that the INA 217 operates at 18v, while the Aquaboy does it at 9v (the v3205 version)

So for what I've been studying, should I need to drop some voltage before going from the Preamp to the Delay?

...or, like, just don't add so much gain to begin with?

What would happen if the preamp uses 9v as well as the delay? I mean, if I go to the pre -> delay, wouldn't those first 9v drop from the preamp to the delay? Should I care for that?

Need to see the datasheet for the chip, but if it'll run from 9V, it should be doable.  Would need the schematic for the actual preamp circuit to figure out what (if anything) needs changed.  If you never ask the preamp to put out more than 9V (or however close the INA can get to the rails), then there won't be any difference at all between the higher and lower supply voltage.

[electromerca]

One thing that concerns me, though, is that the INA 217 operates at 18v, while the Aquaboy does it at 9v (the v3205 version)

So for what I've been studying, should I need to drop some voltage before going from the Preamp to the Delay?

...or, like, just don't add so much gain to begin with?

What would happen if the preamp uses 9v as well as the delay? I mean, if I go to the pre -> delay, wouldn't those first 9v drop from the preamp to the delay? Should I care for that?

Need to see the datasheet for the chip, but if it'll run from 9V, it should be doable.  Would need the schematic for the actual preamp circuit to figure out what (if anything) needs changed.  If you never ask the preamp to put out more than 9V (or however close the INA can get to the rails), then there won't be any difference at all between the higher and lower supply voltage.

As you may have already noticed I'm not an expert in the subject.

I don't know which of these ones suits:
. http://www.ti.com/product/ina217
. http://www.mouser.com/ProductDetail/Texas-Instruments/INA217AIDWT/?qs=sGAEpiMZZMsE1dKaA2ImUPh%2fgv48%2feoeWeHVR9BOfWs%3d

[PRR]

> concerns me....INA 217 operates at 18v, while the Aquaboy does it at 9v... should I need to drop some voltage before going from the Preamp to the Delay?

You can connect 300V tube gear to 5V digi-audio devices. Just don't push it.

But--

INA217 is intended for + and - power supplies.

Since it can run on +/-4.5V (see data), it *can* be re-hacked to run on just +9V with a Vref. But that may not be obvious, or trivial.

While I understand re-packing stuff for minimum space, in this case (and for where you are on the path of learning), it *may* be simpler/quicker to get one of the $49 mike preamp pedals from the Rock Shop and run a cord to the AquaLad. Unplug that cord when you want to use guitar.

[TGP39]

One thing that concerns me, though, is that the INA 217 operates at 18v, while the Aquaboy does it at 9v.

Running two different circuits at two different voltage supplies usually is not a problem (within reason) and in this case, it would be even easier by using the Road Rage power supply circuit that MadBean sells. It has an 18 volt pin and a 9 volt pin. Mind you, the current for both circuits cannot exceed 100mA. This is a limitation of the LT1054 and not the circuit.

Steve.

[electromerca]

Thank you all, guys!!

I'm still on my learning route so your answers helped me a lot