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Thank you for the feedbacks.
@dick_freebird , what is the reference of the Schottky diodes you see on the 12V output line currently (I can't see them)?
Beside the waste of current, the second solution you mention sounds easier to me but I don't get what would be the role of the LDO here? I...
No. Hem... indeed I read the 2N2222 datasheet too quick - I can now see peak base current shall be max 200mA (fortunately the transistor did not seem to compain receiving about the double during my test which lasted a few minutes). For the final implementation I shall find either a higher...
So in the meantime I have been told that those kind of multi voltages SMPS have a of mechanism which makes them use the 5V to "compensate" the 12V (I can't explain, but would be interested to understand if someone can). Meaning that I needed to draw a certain amount on the 5V line to find the...
So far I do not have anything anything connected to the _CTL lines. Now you mention them, not sure if this is normal but when trying to measure the voltage with a multimeter between GND and PC_CTL it makes a light crackling noise (among all the output pins of the PSU, it only happens with...
Hello,
I am trying to reuse a SMPS coming from an old DVD player with internal hard drive. It has among other lines a 12V line (when not feeding anything, multimeter says it actually outputs 11.3V) and a 5.4V (multimeter says 5.2V).
In the original device, those two lines are used to feed a...
Very interesting. I am tempted to go to the next step although I have no more working original unit nor logic analyzer!
I guess I will have to find some alternative for my project...
Thank you again for your time and follow-up!
Thank you very much Brian, I appreciate this detailed explanation which helps me better understand how it works.
Indeed the drive connects to the VLSI named "MIC1". On the schematics here attached, we can see references to ATAPI bottom-left and right-top. Names of the lines do not all exactly...
Just tried something more - I connected the female IDE connector to the male IDE connector with jumper cables in order to have 7 pins (#1, 27, 29, 39, 34 and 21, 31) going through a breadboard where i added the resistors as per the schematics and connected them back to the male IDE connector...
betwixt, from the new table above, I now see that pin 19 is already connected to Ground (I assume that is what you meant when mentioning 0V).
As for pin 32, manufacturer's schematics says it is not connected. I measure -0,54V on it (same value as for several other pins: 1, 20, 21, 23, 25, 27...
Thank you both for the feedback.
About the IDE-USB convertor :
If I plug it to the RPi only (without anything on the IDE side), it is not recognised (I mean nothing relevant is displayed in lsusb output).
If I plug it to both the RPi and my IDE-ZIF adaptor (and behind my ZIF DVD drive), it is...
I did find 12V, 5V and GND effectively supplied to the drive's PCB (actually slightly more: 12,04V and 5,11V).
Comparing the Ground from the power supply and the one from on the adaptor (i.e. in the end from the RPi) I find a difference of 0,02V, but I guess this is not the issue?
Hi Brian,
So to check GND pins (or 0V reference as in your previous post), I guess I should do the following (please correct if necessary):
1. On the one hand i have a chain of devices starting from the RPi => USB link => USB to IDE convertor (GND & 5V power coming from USB) => IDE link => IDE...
Thank you Brian. I am a beginner in electronics, hence my next questions:
1. What means "incompatible"? That the DVD drive's interface does not fit the convertor's? At least theoritecally (I understand it might then prove too long/difficult to obtain) it could be overcome by somehow reverse...
Hi,
I would like to reuse a **broken link removed** originally part of a Samsung DVD player. My goal is to eventually be able to connect it via USB to a Raspberry Pi.
Although this DVD reader is quite similar to a "standard" IDE DVD reader commonly used in desktop PCs for a long time...
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