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Power supplies / (Solved): Voltage drop on SSR01 under load
« Last post by zidor28 on April 07, 2019, 02:54:21 PM »
Per Anders, here is what was at play. The DAC board was actually drawing more than 100mA. The choke was designed for this rating, which wasn't enough. Hence the choke saturated and behaved as a resistance. Installing a choke with higher current capacity has solved the issue. Thanks again for your support and for the regulator.
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Headphone amplifiers / Re: QRV-08 power up
« Last post by peranders on March 25, 2019, 06:53:29 PM »
What is the values of the output voltages?
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Headphone amplifiers / Re: QRV-08 power up
« Last post by svarthvitt on March 25, 2019, 06:30:28 PM »
The two in the middle. The leds stop shining after about five seconds.
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Power supplies / Re: SSR01 - substitute H1 with zener?
« Last post by tk-don on March 24, 2019, 09:55:15 PM »
Great, thanks P-A. I found a rubber cap for a rocker switch which fit perfectly ontop of the LED. Otherwise the assembled SSR01 works excellently it seems - 6.97V output spot on with the calculations.
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Power supplies / Re: Voltage drop on SSR01 under load
« Last post by zidor28 on March 23, 2019, 02:41:31 PM »
This is a good point. I will try and let you know. In the meantime, thanks for your support.
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Power supplies / Re: Voltage drop on SSR01 under load
« Last post by peranders on March 23, 2019, 02:15:52 PM »
If you use a super regulator with 120 dB in PSSR you don't need any inductor.
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Power supplies / Re: Voltage drop on SSR01 under load
« Last post by zidor28 on March 23, 2019, 02:00:36 PM »
In my (limited, certainly) experience, choke rectification works well with a good amount of inductance (within current limits of the choke of course) and can handle lower values of capacitance. I've used this topology in a good number of projects (although never before in a 12V power supply). Let me try to increase capacitance and see how it goes.
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Power supplies / Re: Voltage drop on SSR01 under load
« Last post by peranders on March 23, 2019, 07:03:47 AM »
Why do you have a huge inductor and a very minimal capacitance after the rectifier bridge?
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Power supplies / Re: Voltage drop on SSR01 under load
« Last post by zidor28 on March 23, 2019, 12:48:05 AM »
That's strange indeed. Here are the DC voltage measurements.

Rectified B+ (before even connecting the SSR01): 30VDC
Input voltage on the SSR01 when connected to B+ but with no load on the output: 18.3V
Input voltage on the SSR01 when connected to B+ with a 100R load: 7.3V

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Power supplies / Re: Voltage drop on SSR01 under load
« Last post by peranders on March 22, 2019, 10:29:12 PM »
The input voltage is? Something isn't right here.

Output = 5.2
Q2 = 0.9
IC = 1.67

= 7.77 V is that what you have as input voltage? In order to work properly you must have 18V in min.
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