Re: Aiwa MX-Z3300M receiver repair, no display, capacitors in series
Me too! Can't see any good reason for the extra expenditure...!...
Tube_Dude
Senior Member
Last Activity: 12-17-2024, 08:45 PM
Joined: 02-03-2011
Location: Portugal
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Re: Aiwa MX-Z3300M receiver repair, no display, capacitors in series
Hi, Budm
Quite the opposite. These capacitors are part of a voltage doubler circuit working together with D15, D16 and C17. They turn the input 30 Volts AC in 70 Volts DC at the input of the pre-regulator transistor T15......Leave a comment:
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Re: Sony TA-FB920R no left channel
So the SONY is already running?
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Re: Sony TA-FB920R no left channel
Use any 100 Ohm 5% 1/4 W fuse resistor... It's there only to avoid parasitic oscillation of the output Mosfets....Leave a comment:
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Re: Replacing 4 diodes with a bridge
You can buy it directly from PEAK, like I have done. They ship very fast.
And yes, I love my ESR 60 analyser...
[url]http://www.peakelec.co.uk/acatalog/jz_esr60.html[/url]Re: Replacing 4 diodes with a bridge...r60.html[/url]...Last edited by Tube_Dude; 12-30-2012, 08:18 AM.Leave a comment:
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Re: testing capacitor with multimeter
980uF in a 1000 uF capacitor is 2% of tolerance!
Usually electrolytic capacitors manufactures gave 10% or even more rated tolerance......Leave a comment:
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Re: Quad Op Amp Diagnosis
A good way is to put one multimeter probe at pin 11 (ground), and just move the other along all the IC pinout....Leave a comment:
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Re: Quad Op Amp Diagnosis
Something must be wrong, or you had made a mistake in your measures.
Seeing the schematic.
Pin 4 must have 12 Volts from the power supply. (you measured 4,55)
Pin 11 must have 0 Volts (ground). (You measured - 9,9)Leave a comment:
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Re: Pioneer VSX-521, doesnt power up
Maybe the VBE transistor, used to stabilize the quiescent current of the output stage (Bias) in all temperatures of operation......Leave a comment:
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Re: Mosfet Tester - Good Design?
The word "intrinsic" say it all. It's just not possible to build a Mosfet without the intrinsic parasitic Drain Source Diode.
See some references:
[url]http://irf.custhelp.com/app/answers/detail/a_id/200/~/are-hexfet%E2%AE-mosfets-available-without-the-body-diodes-for-or-ing-psu-outputs[/url].
[url]https://cdn.badcaps-static.com/pdfs/cfe9a5f11570c8756dae153b1facbbe8.pdf[/url]Re: Mosfet Tester - Good Design?<br ...rd "intrinsic"...Leave a comment:
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Re: Mosfet Tester - Good Design?
Sorry, about that....Leave a comment:
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Re: Mosfet Tester - Good Design?
Yes I know it! Sometimes is used a faster diode and with lower voltage drop, in parallel with intrinsic diode of the Mosfet NP structure, to speed up things in certain circuits. But in any case, all Mosfet have the intrinsic diode, and that is the important issue in discussion about the use of your Mosfet tester.
Ahh, and my nick name is TUBE DUDE and not TUBE DIODE or TRIODE...
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Re: Mosfet Tester - Good Design?
This is not a built-in protection diode between D and S, but a "parasitic" diode inherent to the structure and present in all Mosfets....Leave a comment:
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Re: Mosfet Tester - Good Design?
Yes! Maybe the best solution.
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Re: Mosfet Tester - Good Design?
Another LED in parallel and in opposite direction will do the trick... One for P other for N....Leave a comment:
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Re: Mosfet Tester - Good Design?
Invert the battery polarity, and bingo. Now you have a P-Channel MOSFET Tester.
The best is to use a switch for battery polarity inversion, and you have a both channels Mosfet Tester......
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Re: Got myself another scope.
As the lights are driven by a CCS, you can add a suitable resistor for the suited voltage drop, with 80mA current, and use any available lamp voltage...
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Re: Got myself another scope.
As I suspect the vast majority of electronic components are "in the house" PHILIPS components. Transistors, resistors, electrolytics, plastic (MKT) caps (the ones with color code bars). Only in the back part of one PCB (the vertical one at the back of the scope) I see a light blue electrolytic that don't look like PHILIPS original...
What kind are the lights? Round or "fuse" type? Voltage and Amperage? Maybe I can have some in my junk box......
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Re: Got myself another scope.
Hi
No, this Philips scopes are really made by Philips, even you can check it if the OP put some inside pics. I bet the great majority of caps will be the good old blue Philips axial, together with the Philips green body metal film resistors...
Only much later they joined FLUKE for making some Fluke/Philips measuring devices, including scopes......Leave a comment:
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Re: Help with school problem
Absolutely!
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