JFK PA-338 board Roger Beep delay

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13EL121
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JFK PA-338 board Roger Beep delay

Post by 13EL121 » 13 Jan 2019, 15:27

Hi, any idea how to make the beep longer in a JFK with PA-338 board?
Thanks and 73,
Ralf

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Re: JFK PA-338 board Roger Beep delay

Post by dt307 » 16 Jan 2019, 03:18

change value of c166
beep.jpg
schematic http://78roger.free.fr/president/schema/jfk(pc-338).jpg
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Re: JFK PA-338 board Roger Beep delay

Post by 13EL121 » 20 Jan 2019, 11:04

:thumbup: Thank you Chris! Will give it a try.

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Re: JFK PA-338 board Roger Beep delay

Post by 13EL121 » 20 Jan 2019, 12:14

Maybe it looks like C100 0.047? The schematic is not very clear.

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Re: JFK PA-338 board Roger Beep delay

Post by 13EL121 » 20 Jan 2019, 12:39

Found it! C156 is the cap for Roger beep delay. Thanks for your help Chris! :thumbup:

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Re: JFK PA-338 board Roger Beep delay

Post by dt307 » 20 Jan 2019, 13:53

all good happy to help ..... most have a cap in series with the beep on and off switch
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Re: JFK PA-338 board Roger Beep delay

Post by 13EL121 » 20 Jan 2019, 16:12

Yes same as Superstar 360FM or 3900, but I was not able to find it in the schematic. You have seen what I have not seen... The beep switch in the schematic.
I doubled the value of the Tantal cap and the beep sounds like a Jackson now. :D

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