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Old 21st June 2018, 08:34 AM   #11
lineup is offline lineup  Sweden
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Quote:
Originally Posted by Elvee View Post
It is definitely from Philips, thus from the body colour it is either a BAWxx or a BATxx.
Since it is a small body, it must be a BAT, and from the color code (gray/green), it is a BAT85, a small schottky diode.
The low voltage drop (0.5V) also indicates it is schottky diode.
BAT85 is a very good guess.
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Old 21st June 2018, 10:15 AM   #12
lcsaszar is offline lcsaszar  Hungary
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Is there any component symbol (white rectangle) or just a straight line under the diode? In the latter case just bridge it If there is no improvement, restore the original state
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Old 21st June 2018, 04:21 PM   #13
hollowman is offline hollowman  United States
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Default Huh?

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Originally Posted by Mooly View Post
You could also use a normal diode to 'lift' the -5 volts to around -5.6 and see if that has any effect.
I'm limited to a MAX of -5v per the stock, factory-original 7905. See OP of this thread. Yes, the PDF schematic has a 7906, not 7905. But my Philips CD60 uses a 7905.

Also, in the other thread, I noted that I did replace the 1541's -5v rail 5-ohm "safety R" to 0.5-ohm. That brought the voltage up -4.5v (up from -4.3). Noise issue remains.
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Old 21st June 2018, 05:04 PM   #14
hollowman is offline hollowman  United States
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Default No improvement!

Quote:
Originally Posted by lcsaszar View Post
Is there any component symbol (white rectangle) or just a straight line under the diode? In the latter case just bridge it If there is no improvement, restore the original state
Straight, white line underneath (like jumpers).
Bridged it, which brought up Vdd1 to -4.9v.
Noise issue remains!
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Old 21st June 2018, 05:25 PM   #15
leadbelly is offline leadbelly  Canada
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Let the diode go YouTube
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Old 21st June 2018, 06:19 PM   #16
Mooly is offline Mooly  United Kingdom
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Help identify diode!
Default Eh

Quote:
Originally Posted by hollowman View Post
I'm limited to a MAX of -5v per the stock, factory-original 7905. See OP of this thread. Yes, the PDF schematic has a 7906, not 7905. But my Philips CD60 uses a 7905.

Also, in the other thread, I noted that I did replace the 1541's -5v rail 5-ohm "safety R" to 0.5-ohm. That brought the voltage up -4.5v (up from -4.3). Noise issue remains.
Its a standard technique to lift the output a three terminal reg. This shows a 7805, the 7905 would have the diode fitted the other way around (remember the pin outs are different for 79 regs). Use a 1N4148 type diode (small signal type as only a tiny current flows in it). The reg output is raised by the forward voltage of the diode. It works well... and you can use zeners (6v8 or 7v1 Zener) to make for example a 12 volt reg using a 7805, or you can use a resistor/s and make it variable, or you can add a transistor to the ground lead and make a super adjustable regulator with terrific regulation.

Here is the simple way. This adds around 0.65 volts to the reg output.
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