Re: Finished to build but LCD noise.
开云体育About “ground loops” please read...
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? Sent: Saturday, July 29, 2017 11:08 PM
Subject: Re: [BITX20] Finished to build but LCD
noise. ?
I'm just getting started with Diptrace,
so this is the best I can do right now.
All of the electrolytic capacitors are 330uF 16V and all the rest are 0.1uF disk ceramics. I separated out J1's 12V in case I want to up the voltage and throw a 7812 into the other leg. I probably should have used higher voltage caps, but it's what I have on hand and, so far, seems to work fine. Each set of ground pins associated with each connector is tied to the ground leg of the final bypass capacitor. That is, the ground pins for J2 tie to the ground leg of C4, for J3 it's C13, and for J1 it's C12. I had connectors on the schematic for the ground pins, but I thought it cluttered it up. The single ground point is important. I'm sure someone with real EE skills
can do a better job with the schematic and explanation of avoiding a ground
loop. I've attached a JPG of the schematic, too.
Jack,
W8TEE
From: CX8ABF Carlos Molina <cx8abf@...> To: [email protected] Sent: Saturday, July 29, 2017 11:57 AM Subject: Re: [BITX20] Finished to build but LCD noise. ?
Thanks Jack
73 Carlos
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Sent: Saturday, July 29, 2017 12:05 PM
Subject: Re: [BITX20]
Finished to build but LCD noise. ? I'll try to get
that done this weekend and then post it.
Jack,
W8TEE
From: CX8ABF Carlos Molina <cx8abf@...> To: [email protected] Sent: Saturday, July 29, 2017 10:55 AM Subject: Re: [BITX20] Finished to build but LCD noise. ?
Please Jack,
send us the schematic
of the modified PSU.
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73 Carlos
CX8ABF
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CX8ABF Carlos Molina