The reason I ask is the 2698 appears to use the same XL6012 as the 1698 which is a SMPS controller that runs at ~180KHz. The 1698 uses separate Pi LC filters (on +26VDC & -26VDC) for each amplifier (LM1875), so 4 Pi LC filters total. The images of the 2698 show a Pi LC filter for +supply and -supply for both amplifiers, so only 2 Pi LC filters.
I'm considering designing & building a dual amp unit that can support higher voltages an currents (~120Vpp @ ~3A), and maybe even a higher frequency dual amp also. I really like the case Juntek is using, but can't find it.
Edit: We've designed a couple Dual Amps based upon the LM3886 and TDA7293 power amp chips. Both designs utilize the XL6012 SMPS to produce +-40~60VDC to allow higher voltage and current outputs (short term). Both chips feature over current and temperature protection, the TDA7293 provide an output to indicate such, and both have "soft start" capability to reduce turn on glitches. Resettable fuses are incorporated on the power supply input (12-24VDC) and each power amp output. Over-voltage protection on the inputs and outputs should help during actual use. The voltage gain is fixed at 5X and bandwidth is limited by the chips. Two designs were created to compare the these two chips which are specified for audio amplifier use, so hopefully some testing will give an indication how well they performance as an AWG expanded output amplifier.
We also create a 150~180Vpp dual amplifier for very high voltage requirements at lower power levels.
The PCBs layouts were based around the JunTek 1698 case and should fit in the this case or another available from eBay.
Not sure yet which designs will be released for fabrication and test. Attached are images of the 3 PCBs for the Dual Power and Dual HV Amps. First is for LM3886, 2nd for TDA7293 and last is HV version.
Best,
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