Amplifier Modules and PCBs For Sale

[Solve]

I created a follow up soundcard interface using isolated 5V to +/-15V, TPS7A49/30, OPA1656 and INA1651. This module won't be a bottleneck for MOTU M4.

SMT parts assembled by JLCPCB (attached bottom pcb pic).

Don't find it on your site?

 

[Deleted member 148505]

Don't find it on your site?

I only ordered 2pcs for prototyping and for its parts, my orders for both LCSC and Mouser got delayed. So maybe 1 to 2 months before I release it.

 

[Solve]

Ok I buy one when you get it.

 

[Deleted member 148505]

Finally our mouser order has been shipped next batch of Sylph-D200 will be rolled out next week.

 

[turion64]

Finally our mouser order has been shipped next batch of Sylph-D200 will be rolled out next week.

Yeah, Mouser has had problems with both supply & fulfilling orders quickly recently. Digikey seems to be fine but are out of stock of opa1656 op amps as well (like Mouser).

Pete

 

[RogerCl]

On the other hand, Digi-key charges very high shipping costs of 21 euros in Germany if the order value is less than 50 euros. In contrast, Mouser always sends its parts free of shipping costs. For me, that's the reason to buy from Mouser. I'd rather wait two days longer.

 

[RogerCl]

Plan to drive 4-way open baffle speakers on a chain of PC, 8-channel audio interface and TPA3255.

The audio interface is an octo DAC8 Pro that can deliver 4.1Vrms maximum. Should I turn down the voltage on the octo DAC so that the SYLPH-D200s are not overdriven?

 

[Deleted member 148505]

No need since you need 4Vrms for balanced input if you enable PFFB.

Plan to drive 4-way open baffle speakers on a chain of PC, 8-channel audio interface and TPA3255.

The audio interface is an octo DAC8 Pro that can deliver 4.1Vrms maximum. Should I turn down the voltage on the octo DAC so that the SYLPH-D200s are not overdriven?

 

[Deleted member 148505]

Yeah, Mouser has had problems with both supply & fulfilling orders quickly recently. Digikey seems to be fine but are out of stock of opa1656 op amps as well (like Mouser).

Pete

My Mouser order (using UPS courier) has arrived last weekend. However my LCSC order with DHL courier was held by Philippine customs for a week now, looks like Covid surge problems.

 

[454Casull]

No need since you need 4Vrms for balanced input if you enable PFFB.

4V? Website says 2v, unless that figure is for single-ended and single-ended is more sensitivity somehow?

 

[RogerCl]

No need since you need 4Vrms for balanced input if you enable PFFB.

Please confirm the 4Vrms for the SYLPH-D200 again, as the website says 2Vrms maximum.

Input sensitivity (PFFB disabled): 1V RMS
Input sensitivity (PFFB enabled): 2V RMS

Why are the values different for PFFB disabled and PFFB enabled?

 

[Deleted member 148505]

2Vrms for SE/common mode signal, 4Vrms for differential full scale signal.
The module is shipped as default SE (unless requested)

PFFB has around 6dB negative feedback so it has a lower sensitivity.

4V? Website says 2v, unless that figure is for single-ended and single-ended is more sensitivity somehow?

Please confirm the 4Vrms for the SYLPH-D200 again, as the website says 2Vrms maximum.

Input sensitivity (PFFB disabled): 1V RMS
Input sensitivity (PFFB enabled): 2V RMS

Why are the values different for PFFB disabled and PFFB enabled?

 

[RogerCl]

Thank you for the quick answer. So the variant "without PFFB" runs with 4Vrms.

For the variant "with PFFB", one volt less applies. In this case, does something have to be changed in the SYLPH-D200 at 4Vrms?

 

[Deleted member 148505]

Hmm no, with PFFB, the gain will be reduced so you need 2Vrms for SE and 4Vrms for balanced (2Vrms Hot to Gnd, 2Vrms cold to Gnd, 4Vrms full scale).

Without PFFB, you only need 1Vrms for SE and 2Vrms for Balanced connections.

You can reduce the gain by changing the resistors of the inverting opamps.

Thank you for the quick answer. So the variant "without PFFB" runs with 4Vrms.

For the variant "with PFFB", one volt less applies. In this case, does something have to be changed in the SYLPH-D200 at 4Vrms?

 

[Deleted member 148505]

For those who already ordered Sylph-D200 (first 10pcs), your packages will be shipped out on Tuesday, March 24. Thanks!

 

[454Casull]

RogerCl - should be like this:

Input sensitivity - SE (PFFB disabled): 1V RMS
Input sensitivity - SE (PFFB enabled): 2V RMS
Input sensitivity - Balanced (PFFB disabled): 2V RMS
Input sensitivity - Balanced (PFFB enabled): 4V RMS

 

[ricyuyc]

2Vrms for SE/common mode signal, 4Vrms for differential full scale signal.
The module is shipped as default SE (unless requested)

PFFB has around 6dB negative feedback so it has a lower sensitivity.

@JLester, I want my SYLPH-D200 3251 amp board to be Balanced 4Vrms with PFFB implemented, could you configure that for me?

 

[Deleted member 148505]

@JLester, I want my SYLPH-D200 3251 amp board to be Balanced 4Vrms with PFFB implemented, could you configure that for me?

Yes, TPA3251, we will configure it for balanced input.

 

[Deleted member 148505]

RogerCl - should be like this:

Input sensitivity - SE (PFFB disabled): 1V RMS
Input sensitivity - SE (PFFB enabled): 2V RMS
Input sensitivity - Balanced (PFFB disabled): 2V RMS
Input sensitivity - Balanced (PFFB enabled): 4V RMS

Yes, this is correct. Thanks!

 

[454Casull]

Do we have the ability to get the boards customized for balanced input + PFFB enabled + 2 V RMS input sensitivity? I could live with a little bit more noise.