Preamp for class d board

[Wheely]

Does anybody know the best preamp to use with these class d amp boards? something for bluetooth projects etc. needing something that works off d.c power to make things easier.

Im really wanting to try this dual core amp board as it seems to do well on tests.

 

[Wheely]

hoping to use a preamp like this with replaceable op amps and 3 tone controls, but not sure if they are worthwhile. seems decent. I plan on powering the preamp and amp off seperate lithium ion batteries, might help things.

 

[Kimbrough Xu]

Maybe a tube preamplifier like the fosi audio P1.

 

[antcollinet]

How much noise do those fans make when they spin up? They don't look like they'll be particularly quiet.

Also - batteries don't make that good a power supply for a power amplifier. At least not without some filtering, or at least some capacitance, on the output.

 

[Wheely]

I

How much noise do those fans make when they spin up? They don't look like they'll be particularly quiet.

Also - batteries don't make that good a power supply for a power amplifier. At least not without some filtering, or at least some

 

[Wheely]

Ill let you know about the fans. also curious about filtering the power supply if necessary. im looking for quality at the end of the day

 

[Wheely]

Maybe a tube preamplifier like the fosi audio P1.

im going to experiment with those one day for sure

 

[Wheely]

Anyone out there have any idea what the voltage of the standby light would be on this amp?? . I assume a 6volt bulb will work. I need to understand more about powering leds. I just want to build this amp properly and figured it wouldnt hurt to have a proper light hooked up to that 2 pin outlet

 

[Zek]

I need to understand more about powering leds.

Maybe this helps ...

LED Resistor Calculator

Calculate resistor values for LEDs using this simple calculator. Enter any three known values and press Calculate to solve for the others.

ohmslawcalculator.com

 

[antcollinet]

Anyone out there have any idea what the voltage of the standby light would be on this amp?? . I assume a 6volt bulb will work. I need to understand more about powering leds. I just want to build this amp properly and figured it wouldnt hurt to have a proper light hooked up to that 2 pin outlet

we can't guess - you've provided no information at all on the board/specification/connections/circuit.

And I'd suggest if you don't know how to power LEDs that DIY electronics might not be for you.

Oh - and a 6V bulb will almost certainly not work.

 

[Wheely]

we can't guess - you've provided no information at all on the board/specification/connections/circuit.

And I'd suggest if you don't know how to power LEDs that DIY electronics might not be for you.

Oh - and a 6V bulb will almost certainly not work.

oh no, its definitely for me. how are you supposed to learn anyway? Obviously I can manage to power an led, im just not sure the exact perfect voltage that the mute signal will put out when tripped. Its not like Im gonna try and trip it & then put a voltage tester on it. Its a tpa3255 amp board that runs on 24-48 volts. I bet a 6v would work & maybe not even burn out. who knows. if not then a higher voltage. they seem to light up of nearly any voltage anyway. theres some capacitors that say all different voltages all over. not sure about the voltage regulators and converters. Its too easy. clearly I could just try a 48v led and everything would probably be 100% fine but figured Id throw some content on here.

This is what I have going on so far. Im starting to create a box for my amp & working out how I am going to install the banana jacks.

I put different op amps in the preamp already. A pair of NE5532's that came out of the A07 pro. sounds awesome

 

[Wheely]

Been testing this lossless bluetooth 5.0 decoder board on my car deck & I think it actually sounds fantastic. its louder than a cord, which is strange. but definitely clear. should sound great plugged into the preamp with these nice gold plated 3.5mm cords I got

 

[antcollinet]

oh no, its definitely for me. how are you supposed to learn anyway? Obviously I can manage to power an led, im just not sure the exact perfect voltage that the mute signal will put out when tripped. Its not like Im gonna try and trip it & then put a voltage tester on it. Its a tpa3255 amp board that runs on 24-48 volts. I bet a 6v would work & maybe not even burn out. who knows. if not then a higher voltage. they seem to light up of nearly any voltage anyway. theres some capacitors that say all different voltages all over. not sure about the voltage regulators and converters. Its too easy. clearly I could just try a 48v led and everything would probably be 100% fine but figured Id throw some content on here.

This is what I have going on so far. Im starting to create a box for my amp & working out how I am going to install the banana jacks.

I put different op amps in the preamp already. A pair of NE5532's that came out of the A07 pro. sounds awesome

Do you know what current the trip output will deliver. A bulb of any voltage will almost certainly overload (and may break) it.

LEDS are current driven, not voltage driven. Forward voltage drop of a typical signaling LED is in the 1V to 2V range (though modern high brightness (lighting type) leds can be much higher. You need to power leds from a current controlled source rather than a voltage output. With simple leds the normal way to do that is to select a resistor that limits the current to the LED rating, at whatever voltage the source is.

 

[Wheely]

so I have to come up with a whole circuit with a proper calculated resistor? I cant just put an led of a specific voltage on the positive and negative of the socket?

 

[antcollinet]

so I have to come up with a whole circuit with a proper calculated resistor? I cant just put an led of a specific voltage on the positive and negative of the socket?

No - as I said, LEDS are rated for a particular current, not for a particular voltage, and you'll still need to know if that output can deliver the required current. But "whole circuit" for a single resistor is a bit of a reach

Do you get a circuit diagram for the boards?

 

[Wheely]

No - as I said, LEDS are rated for a particular current, not for a particular voltage, and you'll still need to know if that output can deliver the required current. But "whole circuit" for a single resistor is a bit of a reach

Do you get a circuit diagram for the boards?

no diagarams at all, no. I just know there are tons of led lights to choose from but you have to choose a voltage. lots with a red & black wire already attached

 

[antcollinet]

no diagarams at all, no. I just know there are tons of led lights to choose from but you have to choose a voltage. lots with a red & black wire already attached

Send me a link to one - I'll have a look.

 

[Wheely]

To which sorry? One of these amp boards or the led bulbs?

 

[antcollinet]

To which sorry? One of these amp boards or the led bulbs?

The voltage rated LEDs with wires attached.

 

[Wheely]

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