http://www.ti.com/lit/ds/symlink/tpa3118d2.pdf
Page 14. The resistors on the Sanwu boards for gain setting are : R27 (= R2 in datasheet) and R28 (= R1 in datasheet). That's all.
Irribeo added that there is an error in the datasheet. You can set the amps for 20 dB by just omitting resistor R27 (often but not always 75 kOhm on the Sanwu boards). The value itself does not matter much it seems when 20 dB (10 x amplification for those allergic to logarithmic) setting is chosen. This was acknowledged on the TI forum.
Page 14. The resistors on the Sanwu boards for gain setting are : R27 (= R2 in datasheet) and R28 (= R1 in datasheet). That's all.
Irribeo added that there is an error in the datasheet. You can set the amps for 20 dB by just omitting resistor R27 (often but not always 75 kOhm on the Sanwu boards). The value itself does not matter much it seems when 20 dB (10 x amplification for those allergic to logarithmic) setting is chosen. This was acknowledged on the TI forum.
Last edited:
So to reduce the gain to 20 dB you just remove R27 and leave that space open or do you have to replace it with a jumper?
Leave it open and it will be 20 dB. Irribeo already did this, I haven't done mine yet but I will.
Will there be any benefit in adding a 'smoothing' capacitor at the power input of the stock sanwu 3118?
There's not room inside for an excessive amount of ccs circuits, therefore:
Undervolted 20db
Nominal power voltage, 26db
Maxed power voltage, 32db
The gain that you should set is likely to correspond to the power voltage utilized. That is typical, but just bear in mind that mine has not yet arrived in the mail...
Jumpers for promoting short circuits aren't likely to be necessary. That bit with the switch is a much finer idea.
On some ampboards the gainsetting has very big effect on soundquality, not just on bass.
On some ampboards psu voltage has very big effect on soundquality, not just on treble.
See what you find.
edit: if you browse the web you can find several distortion measurements for tpa3116/18, some show dominant 3rd order, some show dominant 2nd order, for identical ampboards, the psu (not voltage) is the difference there too 🙂
On some ampboards psu voltage has very big effect on soundquality, not just on treble.
See what you find.
edit: if you browse the web you can find several distortion measurements for tpa3116/18, some show dominant 3rd order, some show dominant 2nd order, for identical ampboards, the psu (not voltage) is the difference there too 🙂
Last edited:
if anyone wants ti 3118 goodness then tread carefully if you think the smsl 36a pro holds the answers...seems they have had a change of heart for 2015,or at least a change of chip...
??????????-S.M.S.L ?SA-36A pro(2015)? ?????????[TDA7492PE???] ( ????? ) - NorthFlatJapan ????? - Yahoo!???
??????????-S.M.S.L ?SA-36A pro(2015)? ?????????[TDA7492PE???] ( ????? ) - NorthFlatJapan ????? - Yahoo!???
So I was looking for a tiny tip for my Weller and they wanted $11 for one. I ordered this iron for $5 more and it comes with 6 tips (one is a tiny one for SMT) and it has variable temp, is very lightweight, heats up almost instantly, has a LED to show its on. Very impressed with quality and function for $16 with 6 tips. They are Hakko style tips which is a plus. Sorry for the OT but I think I found my SMT iron.
http://www.amazon.com/gp/aw/d/B014KBIB3M/
http://www.amazon.com/gp/aw/d/B014KBIB3M/
I agree and this had me worried as I bought one recently and had to open it to verify. Luckily I got the 3118.
I have used it in its own board but it's bigger brother 7498 sounds much better. The 3118 is better than 7492.