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Old 13th May 2002, 02:47 AM   #11
jleaman is offline jleaman  Belgium
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Default Here is the one that i am talking about.

Here is the pic
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File Type: jpeg power.jpeg (57.0 KB, 740 views)
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Old 13th May 2002, 08:20 AM   #12
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That is exactly the one I was thinking about.
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Old 16th May 2002, 09:06 PM   #13
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Default Switching amplifier - cheap and dirty!

I've built a switchmode amp using a 556 (dual 555) cmos timer and a power mosfet output. It actually works quite well, but nowhere near the quality of a ZEN.

Set one section as an oscillator at whatever frequency. Run the output of that section to the trigger input of the other section. On the control voltage line of the second, run the analog input in here. The output of the second section goes to the FET.

Voila, a switchmode amp.

It is a cool little project. (I used it for preliminary research for high-efficiency subwoofer amp when I worked for a car audio company)

Matt
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Old 20th May 2002, 01:44 AM   #14
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Matt MacBeth, do you mind giving us a schematic using a 556 timer as a switching amplifier.
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Old 20th May 2002, 01:49 AM   #15
jleaman is offline jleaman  Belgium
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Default here

Here is the switch mode powersupply used in this amp in protel format it is zipped if there is a question please email me ill answer to my best this is just copyed from the page ( from magazine ) to schematic in protel

Jason
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File Type: zip switching amp.zip (4.3 KB, 143 views)
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Old 20th May 2002, 04:29 AM   #16
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I don't have protel. Please convert it into GIF, JPG, or PDF.

I would like a schematic from Matt MacBeth that uses a 555 timer.
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Old 20th May 2002, 06:40 AM   #17
jleaman is offline jleaman  Belgium
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Default i dont know how to .. convert

I dont know how to convert it to pdf or i would..

Do you know how to..


Jason

how do i convert to a jpeg or pdf
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Old 20th May 2002, 07:40 AM   #18
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here it is in gif format i zipped it because it is too large to be accepted here otherwise.
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File Type: zip schematic.zip (23.5 KB, 132 views)
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Old 20th May 2002, 08:00 AM   #19
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AudioFreak, it is a Bitmap file not GIF. Also is a switching power supply.

JasonL, ever heard of using the Print Screen in either Windows or LINUX.
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Old 20th May 2002, 08:04 AM   #20
jleaman is offline jleaman  Belgium
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Default Yeah i can do that

Well if you want i can do that and didnt you know tha t PROTEL doesnt work in LINUX
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