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Old 17th April 2005, 04:33 PM   #1
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Question Help - Z4 sick on startup

Help, I finished one channel of my Z4 last night (enough to give her a try) Voltages seen ok but very little gain, lots of distortion and very hot in the area of c10. the pcb and mosfets are well mounted on a very large heat sink.
Thanks in advance for the help,
Ralph

ps: i am a radio ham and this is my first real audio project.
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Old 17th April 2005, 04:42 PM   #2
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Hi Ralph and welcome.

What do you mean with 'very hot in the area of c10' ?
Is C10 getting hot or the zeners or...?

/Hugo
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Old 17th April 2005, 07:53 PM   #3
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it seems that c10 is the source of the heat, but i am not sure...
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Old 17th April 2005, 08:04 PM   #4
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Ralph,
R0, R1 are close to C10 and apart from the mosfets they are about the hottest parts in the amp.
What source did you use to feed the input?

/Hugo
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Old 18th April 2005, 03:36 PM   #5
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Hugo,

It seems that C10 is the source of the heat but i will check again tonight. I am using the headphone output from another amp for test purposes - as sooon as i get this Zen4 up and running i plan to build a preamp.


Thanks for the help, Ralph
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Old 18th April 2005, 06:50 PM   #6
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If you have a multimeter check C10 to see if it is shorted. Also check the board for solder splashes and to see if you have the right components in the right spots. Triple check it. Did you use the component values as called out in the article? You say the voltages are correct. Make sure of this because it can give us a hint when helping you. It would be handy to note the exact voltages you read.
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