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The Objective2 (O2) Headphone Amp DIY Project
The Objective2 (O2) Headphone Amp DIY Project
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Old 14th September 2018, 02:25 PM   #5291
sgrossklass is offline sgrossklass  Germany
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Join Date: Nov 2004
Location: Germany
Quote:
Originally Posted by laserscrape View Post
what would be the lowest possible value to use for R10, R11, R15, R18?
Honestly the 1 ohms suggested already are quite low already. Doesn't take much of an input offset delta between L and R to get one or more mA flowing (current that's basically wasted, doing nothing but loading the opamps). If in doubt, check what sort of voltage differential you are actually getting (requires a multimeter comfortable with measuring in the single-digit mV range). It may not hurt to have a few 4556s on hand to select manually. Usually their offset delta appears to be low (as expected in a bipolar input part) but there's the occasional bad apple.
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Old 16th September 2018, 11:28 AM   #5292
jasonhanjk is offline jasonhanjk  Malaysia
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Join Date: Jun 2004
Location: Singapore and Malaysia
Just manage to learn Altium's component creation for the transformer. Not that hard after watching YouTube tutorial.

Quote:
P1 - Figure 8 AC inlet
https://sg.element14.com/multicomp/j...pcb/dp/9248161

S1 - DPST switch
2Pin 3Pin SPST SPDT Car Rocker Boat Switch ON/OFF ON/ON 2 Positions Red Blue Black Green 12V 6A/10A 250V/125VAC 19x13mm Mount -in Switches from Lights & Lighting on Aliexpress.com | Alibaba Group

F1 - Fuse holder and fuse 0.2A
10pcs/lot 5*20mm 5x20mm fuse holder with transparent cover free shipping-in Fuses from Home Improvement on Aliexpress.com | Alibaba Group
5x20mm 250V Glass tube fuse Fuse cutout 0.1A0.2A0.3A0.4A0.5A0.63A0.75A0.8A1A1.5A2A2.5A3A3. 15A4A5A6A6.3A7A8A10A12A15A20A25A30A -in Fuses from Home Improvement on Aliexpress.com | Alibaba Group

T1 - 115V/230V to 2X 12V transformer
https://sg.element14.com/vigortronix...15v/dp/2817631

D1 to D4 - Ultra Fast Diode
https://sg.element14.com/multicomp/u...4al/dp/2675014
Tomorrow will try paper cut out to see the fitting of the above components.
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Old 17th September 2018, 06:22 AM   #5293
jasonhanjk is offline jasonhanjk  Malaysia
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Join Date: Jun 2004
Location: Singapore and Malaysia
According to the paper cut out, all should fit in this case.

YGS 010 106*55 100mm (WxH D) design case box electronic extrusion aluminum metal electrical enclosures-in Connectors from Lights & Lighting on Aliexpress.com | Alibaba Group

Only 90mm width of the PCB is able to use when using the above enclosure.
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File Type: jpg IMG_20180917_134035.jpg (403.9 KB, 24 views)
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Old Today, 03:37 PM   #5294
kiler is offline kiler
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Join Date: Sep 2018
Hello guys, I got a question. So my objective 2 worked perfectly for about 4 years now, but a day or two ago it just stopped lighting the red LED while connected to the ac power supply. I've measured the power supply and it reads the correct voltage, which means the power adapter shouldn't be what went wrong.

So I'd like to know what would be the next troubleshooting I could do to figure out what is wrong.

Thanks in advance
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