[Switching Power Supply Regulator]

Hi Ante,

Sorry for the missing info, i was a little fustrated when i wrote this topic.

The regulator is for a Amstrad  SRX2001 Satelite receiver, I can't find a schematic for it.

The Powersuply is sending a pulsing 0 to 60 V ot on a 24 V pin, i have tried to replace almost everything else but the regulator.

So I see this as my last chance to succseed.

Thanks for your interrest in my little problem.

[Switching Power Supply Regulator]

Hi i am looking for a datasheet for a Switching Power Supply Regulator.
It is a 8 pin IC on the top is a National Semicoductors symbol.
The number of it is:
M57AL
AMS42577

Hope you can help me.

Thanks

Dennis

[Gould 1421]

Hi!

I was wondering if any of you know where to find a schematic over a Gould 1421 (20 MhZ) Oscilloscope. If you do pleace post.

Hope you can help me.

-->Jabber<--

[Fail in 100W amp. diagram!!!]

Hello you guys.

In the Projects->audio  section
(http://www.electronics-lab.com/projects/audio/017/)
there is this a amplifier project to be built.

I've gone through the schematic, and found some fails. For one thing, the Basis and Emitter of Q5 is shorted, witch is NOT ment to be as it will blow up the transistor.

The second fail i've found is that the Resistor R6 is placed wrong. If you place it the way the schematic shows, you will have a short between the Emitter of Q2 and Basis of Q3, witch is both NPN transistors.

My adwise is to build the amp after the PCB (it seems correct) rather than using the Schmatic.

If someone out there have tryed to build this project i wouldlike to hear from you, maby you have some tips for me.

See ya.  ;D