EEVblog Electronics Community Forum
A Free & Open Forum For Electronics Enthusiasts & Professionals
Welcome,
Guest
. Please
login
or
register
.
Did you miss your
activation email
?
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
This topic
This board
Entire forum
Google
Bing
Home
Help
Search
About us
Links
Login
Register
EEVblog Electronics Community Forum
»
Electronics
»
Repair
»
Missing inverter components identification
« previous
next »
Print
Search
Pages: [
1
]
Go Down
Author
Topic: Missing inverter components identification (Read 465 times)
0 Members and 1 Guest are viewing this topic.
jerryk
Regular Contributor
Posts: 228
Country:
Missing inverter components identification
«
on:
January 14, 2024, 05:10:13 am »
I have a Magnum MS2012 inverter that had some components removed that I'm trying to identify. I have attached some photos of an old board that I repaired that had these components intact if this helps. Problem is they are ceramic caps with no labels and part of me thinks the cap values could be critical on the charge pump IC. Just afraid of screwing it up by experimenting. Here are the datasheets for the two IC's.
AD8672 (missing cap C33)
and the
TC7662B (missing cap C35).
I attached a couple of crude partial schematics showing the caps location in the circuits.
It's actually a nice little inverter that I think it's only original problem was corrosion. Then the owner dropped the cover on the main board. Hence the missing components.
As always any help is appreciated.
Jerry
Logged
fzabkar
Super Contributor
Posts: 2735
Country:
Re: Missing inverter components identification
«
Reply #1 on:
January 14, 2024, 08:47:02 pm »
The application examples in the TC7662B datasheet would suggest a value of 10uF for C35.
AD8672-A appears to be configured as a voltage follower. Is OUT A connected to +IN B of AD8672-B via a resistor? If so, what is the value of this resistor?
«
Last Edit: January 14, 2024, 08:58:30 pm by fzabkar
»
Logged
The following users thanked this post:
jerryk
jerryk
Regular Contributor
Posts: 228
Country:
Re: Missing inverter components identification
«
Reply #2 on:
January 14, 2024, 10:55:41 pm »
Here is a more complete schematic of the 8672. I corrected the resistor value between OUT B and -IN B
Edit: I cannot find where the input to the voltage divider that feeds +IN B. I don't know if that's needed or not. Also sorry about the crude schematics above. I screwed up Kicad on my laptop and took a moment to figure out what I did.
Jerry
«
Last Edit: January 15, 2024, 07:20:35 pm by jerryk
»
Logged
Print
Search
Pages: [
1
]
Go Up
« previous
next »
Share me
Smf
EEVblog Electronics Community Forum
»
Electronics
»
Repair
»
Missing inverter components identification
There was an error while thanking
Thanking...
EEVblog Main Site
EEVblog on Youtube
EEVblog on Twitter
EEVblog on Facebook
EEVblog on Odysee