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Inside the Creek OBH-2 Power Supply

post #1 of 3
Thread Starter 
Have any of you guys opened up the Creek OBH-2? Well, I did, and in my opinion this is nothing but a glorified wall wart. It uses an LM317 voltage regulator, but what is surprising is that there is also an LM317 on the OBH-11SE's circuit board as well. So, why do you need 2 voltage regulators? Isn't the on board regulator good enough?
post #2 of 3
You can get some improvement in performance by using two regulators, the first one regulating to a higher voltage then the second one. (say 18 volts on the first one, 15 on the second one as an example).
I would suspect that the factory wall wart that is used if you don't get the OBH-2, is not regulated in itself, so one is built into the amp. Then the upgrade path (OBH-2) would provide a second level of regulation, along with higher current, as a way to improve performance.
post #3 of 3
Thread Starter 
I understand what you're saying about getting higher current with 2 regulators. But is this really necessary for such a low-powered amplifier,such as a headphone amp? Why wouldn't the on-board LM317 regulator be good enough,such as in the OBH-11SE?

There are many people that use the regular OBH-11 with the small unregulated wall wart and get great performance. Also, on the Creek website, they state that both amps have on-board regulators.
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