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Old 22nd March 2013, 07:51 PM   #511
PetruV is online now PetruV  Romania
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They are ceramic caps so i can safely use thes round orange ones i have a lot of,i heard they are also used for decoupling so it will work

BTW wima caps are expensive,and probably imposible to find in shops,so im using my ceramics afte you give me the ok
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Old 23rd March 2013, 05:18 PM   #512
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D200 on test
D200 JUST TEST - YouTube
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Old 23rd March 2013, 06:27 PM   #513
norazmi is offline norazmi  Malaysia
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what mosfet do you test apex? gate? and rail voltage?
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Old 23rd March 2013, 07:04 PM   #514
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Quote:
Originally Posted by norazmi View Post
what mosfet do you test apex? gate? and rail voltage?
Not my work, this D200 made by Suryadi Achmad work at +/-45V with 10N60 mosfets.
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Old 23rd March 2013, 07:33 PM   #515
norazmi is offline norazmi  Malaysia
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oh okay, ill make it stereo for test
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Old 26th March 2013, 06:58 AM   #516
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Quote:
Originally Posted by Tekko View Post
Or you can place an order with itead studio and get ten boards for 28 us dollars shipped, though this requires having access to the PCB gerber files, which i'd guess is a well regarded secret locked away at apex's PC. Assuming Apex dident just draw his pcb's with a picture editing program such as photoshop, ms paint or similar.

and no norazmi, you cannot use a LS series ic, the circuit assumes and requires a HC series ic which is a mosfet based ic wheres the LS series is bipolar transistor based, the LS series is also much slower.
thanks Tekko....
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Old 27th March 2013, 03:00 AM   #517
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Anyone tested the over current protect? Will the over current in mosfet be reflected in output current sense fast enough? There's no delay after the trigger too.

Last edited by jlester87; 27th March 2013 at 03:11 AM.
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Old 27th March 2013, 10:43 AM   #518
PetruV is online now PetruV  Romania
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Originally Posted by jlester87 View Post
Anyone tested the over current protect? Will the over current in mosfet be reflected in output current sense fast enough? There's no delay after the trigger too.
I was about to ask that
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Old 27th March 2013, 01:46 PM   #519
norazmi is offline norazmi  Malaysia
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it must have a delay after protection triger, i`ve done it before with 555 timer, 1N5401 and PC817.
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Old 27th March 2013, 02:16 PM   #520
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Hi Azmi,

I've traced the circuit for the protection. It uses 2 of the NAND gates(pins 1 to 6) for shutdown control, the input for the pins 1 and 2 of 74HC00 (encircled in the attached pic) is normally "low", when there's a voltage across the current sensing resistor, pins 1 and 2 will go "high", resulting pin 6 to output high then triggers the SD pin of IR2110.

But there's no delay for the trigger, the 47uf connected in pin 5 is only for startup delay.
I'm afraid the protection will loop fast (assuming current sensing in speaker out works) and might lead to mosfet destruction.
Attached Images
File Type: jpg APEX UCD2002.jpg (340.2 KB, 758 views)

Last edited by jlester87; 27th March 2013 at 02:17 PM. Reason: adding picture
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