I recently got a Dayton DTA-120. The original Tripath version, no bluetooth. I traced the circuit and figure out some possible mod points... I know this is a discontinued model, but I suppose some DAT-120 owners might find it interesting/useful.
-- DTA-120 uses a TC2000 driving two STA508 (40v, 4.5A), parallel output suitable for 4 ohm loads, similar to the 41hz amp11.
-- volume pot is 50K, which I think is way too high a value.
-- input resistor, Ri (in the TK2050 datasheet)=R9/R10 on the DTA board, 8.2k
-- input cap, Ci= C9/C10, tiny ceramic caps, measured 1.72uf in-circuit, probably 1.8uf caps.
-- Rf (in the TK2050 datasheet) = R23/R24, 20k
-- cap for power rail is 2200uf/35v, "JP" brand.
-- it uses one 7805 to provide 5v
overall build quality is quite good. The main potential problem I can see is with the thermal management: the PCBA slides into the enclosure during assembly, there is no way to guarantee good contact between the STA508's (on the underside of PCBA) and the enclosure. The DTA-100a has similar problem (I took one apart before). The factory simply applied a lot of thermal grease in the contacting area and hope it will work well enough.
-- DTA-120 uses a TC2000 driving two STA508 (40v, 4.5A), parallel output suitable for 4 ohm loads, similar to the 41hz amp11.
-- volume pot is 50K, which I think is way too high a value.
-- input resistor, Ri (in the TK2050 datasheet)=R9/R10 on the DTA board, 8.2k
-- input cap, Ci= C9/C10, tiny ceramic caps, measured 1.72uf in-circuit, probably 1.8uf caps.
-- Rf (in the TK2050 datasheet) = R23/R24, 20k
-- cap for power rail is 2200uf/35v, "JP" brand.
-- it uses one 7805 to provide 5v
overall build quality is quite good. The main potential problem I can see is with the thermal management: the PCBA slides into the enclosure during assembly, there is no way to guarantee good contact between the STA508's (on the underside of PCBA) and the enclosure. The DTA-100a has similar problem (I took one apart before). The factory simply applied a lot of thermal grease in the contacting area and hope it will work well enough.
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space available for mods:
-- on top of headphone jack/line-in jack: 0.87"x1.5"x1.1", on either sides of pot;
-- above volume pot: 0.5"x0.57"
*** enough space for input-cap upgrade, change to film caps.
open area in the middle of the board: 1.3"h x 2.7"w x 1.85"d
*** use for power-cap upgrade, and output filter upgrade
the output filter area is ~1.3" deep
-- on top of headphone jack/line-in jack: 0.87"x1.5"x1.1", on either sides of pot;
-- above volume pot: 0.5"x0.57"
*** enough space for input-cap upgrade, change to film caps.
open area in the middle of the board: 1.3"h x 2.7"w x 1.85"d
*** use for power-cap upgrade, and output filter upgrade
the output filter area is ~1.3" deep
Got to play with a DTA-100 board as well. This thing uses tripath chipset (TC2000+TP2050).
one 7805 to generate 5v.
power cap is 2200uf/35v, R&C brand
There are holes in PCB around the TP2050 chip, an external heatsink can be securely attached, if one wants to recase the boards into a different enclosure.
Ri: R10/R12, 8.2k
Rf: R11/R13, 20k
Ci: C34/C35 (tiny ceramic capacitors) --> L5/L6 --> switch in headphone jack --> center tap of pot (50k)
Output filter components appear to be the same as in DTA-120.
The power jack is of much lower quality than the one in the DTA-120.
one 7805 to generate 5v.
power cap is 2200uf/35v, R&C brand
There are holes in PCB around the TP2050 chip, an external heatsink can be securely attached, if one wants to recase the boards into a different enclosure.
Ri: R10/R12, 8.2k
Rf: R11/R13, 20k
Ci: C34/C35 (tiny ceramic capacitors) --> L5/L6 --> switch in headphone jack --> center tap of pot (50k)
Output filter components appear to be the same as in DTA-120.
The power jack is of much lower quality than the one in the DTA-120.
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