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"The Wiener" TPA3118 amplifier, group buy #3 + "Wiener Pro" prototypes.

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#182
gordon_lo said:
I'm going to pay CAD620 if my calculation is correct.
3118/8 stereo x 2 (200)
3118/8 PBTL pair (210)
Pro/8 x 1 (185)
International shipping(25)
Click to expand...
Five cards will most likely exceed the 2kg limit of the Small Packet Air service I usually use, and definitely won't fit in the padded envelopes I normally use to mail cards out. Plus it's 595 CAD worth of card, so you probably want package tracking 🙂

Mind paying just the 595? When I've got your cards built and packed up, and have a box I can measure and weigh, I'll get the balance from you to cover the shipping.

Thanks!
 
#188
Hi Gmarsh,
Regarding the pro board, there is a "standby" pin, can you describe how should it be connected?

I am thinking:
1. Keep power to the DC in (16-36V)
2. Short the "standby" pins to keep the amp in standby mode
3. When I want the amp to operate, release the button and let the standby pin opens.

Am I right for the above configuration? Thanks
 
#195
kenneth_obee said:
Thanks.
One more question about the Wiener Pro. I read the 3250 datasheet and can't find the gain setting. So is it a fixed gain design (20dB)? And the gain setting you provided onboard is for setting the gain in opamp? Do I need to power off the board first when I want to change the gain?
Click to expand...

Right - the TPA3250 doesn't have built in gain control. I'm providing gain adjustment in the front end differential receiver stage by providing a spot to plug in a resistor, which modifies the gain of the circuit.

Gain can be adjusted live in theory, but I'd suggest putting the amp in standby at the very least to prevent any pops/bangs going to your speakers.
 
#197
gmarsh said:
Right - the TPA3250 doesn't have built in gain control. I'm providing gain adjustment in the front end differential receiver stage by providing a spot to plug in a resistor, which modifies the gain of the circuit.

Gain can be adjusted live in theory, but I'd suggest putting the amp in standby at the very least to prevent any pops/bangs going to your speakers.
Click to expand...

Thanks a lot Gmarsh.
 
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