Two Objective 2's Work on Batteries, not AC Power - diyAudio
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Old 20th January 2012, 10:34 PM   #1
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Join Date: Dec 2011
Default Two Objective 2's Work on Batteries, not AC Power

Please help. I just built a second Objective 2 Amp to see if it will have the same problem and it does. They both work perfectly on batteries but the AC Adapter will not work and without that I have no power to the batteries to recharge or to use it without batteries which I know it can. There is no way two of them can do the exact same thing without a part being broken or something wrong right? Please help me!

Note: Don't mind the missing OPAMP on the one picture, I accidentally only ordered 1 for the kit, but I tried all the OPAMPs in each kit and just switched it to the new one. Please help!

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Old 21st January 2012, 06:23 PM   #2
w1ael is offline w1ael  United States
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Join Date: Jan 2012
Location: East Tennessee
Not having a unit yet, I am planning to build an O2 when I can manage to find a PC board and kit the parts. As a long time ham radio operator and electronic engineer, I am too proud (and cheap) to buy an assembled unit, but I can try to help you to troubleshoot your units. Can you test the power supply output separately? w1ael (Allan)
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Old 21st January 2012, 07:22 PM   #3
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Join Date: Dec 2011
Thanks Allan,
I tested the AC Adapter and it turns out it was a dud. My boards are perfect. The PC board can be found at JDS Labs Inc. and the parts list can be found on NwAvGuy's website. I actually have a very nice kit that I could sell you if you wanted to put it together. It will look exactly like this one but I changed the resistors to a 715 Ohm Gain and a 133 Ohm Gain I think. But I will include batteries as well. I can just ship the parts to you. Let me know, this is what it looks like:

JDS Labs - Assembled Objective2 Headphone Amplifier

Without the silver knob though but a Black one with a White line. Send me a PM if your interested in it.
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Old 23rd January 2012, 08:26 AM   #4
w1ael is offline w1ael  United States
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Join Date: Jan 2012
Location: East Tennessee
Question O2 kit

I am interested. Please tell this newbie how to send a private message. Thanks, w1ael
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