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D

Deleted member 148505

Hi Tan,

Yes it is applicable. I forgot to mention though that we need right angle connectors for the inputs as the board will block them.

Also some caps might need to be replaced with lower height or be soldered under the PCB. (I saw Brad did it on his board since the caps might be taller than the daughtercard, attached pics from his implementation )

The boards will arrive next week :)

Regards,
Lester
commstech said:
Not sure what version of the amp I got from you, but is this buffer board applicable to your earlier amp?
Click to expand...
 

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Deleted member 148505

I tested the overvoltage protection (changed zener diode to lower value) and reverse voltage protection in TICore260BTL, for power supplies with robust protection like LRS-350-36 and SMPS300RS, it is working as expected, reverse protection and overvoltage protection works.

But when I tried it on my generic meanwell chinese clone, the copper trace in the PCB SCR area went poof and acted like a fuse (attached pic). No damage on either the SMPS or the TPA3255 module since the voltage that I tested it on is below TPA3255's max voltage. (looks like OCP on cheap smps is not implemented on its output and only relies on mains fuse, when the pcb trace went busted, overcurrent stopped and saved the smps)

So in the latest Sylph-D200 version V1P, I thickened out the said trace. I haven't tested it in my chinese meanwell clone though since the SMPS might get busted lol.
 

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D

Deleted member 148505

Moment of truth...

It is working! :). I don't have TO-92 LM337 here so I bypassed it for testing.

Final voltage for the opamps will be +/- 6.5V DC

Just short out the input coupling caps in the front to get the full potential.

No slow ramp problem, fix is already integrated.
 

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Deleted member 148505

TICore260BTL Dual Supply Buffer Price

TICore260BTL DS Buffer with 2pcs OPA1656 price for TICore260BTL users is 16 USD

+ Shipping fee, Max 100g, can ship around 3 to 4pcs per parcel.

USA = 15 USD
Australia = 18 USD
France = 9.5 USD
Germany = 8.5 USD
New Zealand = 11.5 USD
UK = 9.5 USD
Rest of the World = 15 USD
 

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nautibuoy

nautibuoy

Member
Joined 2010
JLesterP said:
Buffer is unity gain and uses the same circuitry as the original. :) Input sensitivity is 1.3Vrms in non-PFFB mode.
Click to expand...

I did most of the work to install my TICore260BTL and SMPS600RS modules into a chassis over the weekend - just need to finalise the mains supply wiring to the SMPS and install some phono sockets to complete the build. I had it playing music with the new SMPS - all worked very well except I was playing with my passive attenuator at, or about, maximum and could have done with a little more volume.

My TICore260BTL is a standard built and I use single-ended inputs - my sources are all about 1Vrms output so an input sensitivity of 2.5Vrms is a bit limiting - how can I increase the input sensitivity with single-ended input?
 
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Deleted member 148505

nautibuoy said:
I did most of the work to install my TICore260BTL and SMPS600RS modules into a chassis over the weekend - just need to finalise the mains supply wiring to the SMPS and install some phono sockets to complete the build. I had it playing music with the new SMPS - all worked very well except I was playing with my passive attenuator at, or about, maximum and could have done with a little more volume.

My TICore260BTL is a standard built and I use single-ended inputs - my sources are all about 1Vrms output so an input sensitivity of 2.5Vrms is a bit limiting - how can I increase the input sensitivity with single-ended input?
Click to expand...

Hi, you can't change the gain since the opamps are using single supply configuration, it'll have an issue with stability because DC offset (if there's any) will be amplified by the next opamp stage.

You need to disable PFFB to get the gain back.

You can change the gain of the opamps once you receive the split supply daughtercard module, you need 15K 0603 resistors (I'll check if I have a stock here)

Regards,
Lester
 
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Deleted member 148505

nautibuoy said:
Thanks Lester. I interpret that as my best strategy being to do nothing until I get the new buffer (i.e. leave PFFB enabled and increase the gain with the new buffer) - do I have that right?

Ray
Click to expand...

You can disable PFFB now to increase the gain while waiting for your new buffer.
Wick out solder jumpers under the input coupling caps near the heatsink.

What's your attenuators impedance?
 
4

454Casull

Member
Joined 2004
JLesterP said:
Buffer is unity gain and uses the same circuitry as the original. :) Input sensitivity is 1.3Vrms in non-PFFB mode.
Click to expand...
Brrt. So you can only change system gain by modifying the main amp board, and by replacing resistors at that?

I thought the buffer would be a good opportunity to make easy changes to gain. Perhaps two versions, one for unity gain (existing) and one for high gain, so that max power can be achieved with balanced input 1.5-2.0 Vrms.
 
D

Deleted member 148505

454Casull said:
Brrt. So you can only change system gain by modifying the main amp board, and by replacing resistors at that?

I thought the buffer would be a good opportunity to make easy changes to gain. Perhaps two versions, one for unity gain (existing) and one for high gain, so that max power can be achieved with balanced input 1.5-2.0 Vrms.
Click to expand...

I designed the buffer such that there will be minimal changes needed for existing TICore260BTL boards. Only shorting out the 4 input coupling caps is required (and the main purpose of it).

Side benefit is that we can now increase the gain without stability issues.

Regards,
Lester
 
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