please help with complex dmm connector

[harp]

Maybe now he decide to post... This forum is become so unreliable... I hope you see the attachment... So, I have newer cheap 830 dmm, and I am not happy with beeping mode. Its output is from IC directly, so he wont beep unless the diggit become too low. I want to beep function is thrully analog, like the old one, and think to atempt modification with insert beeping circuit. But, I dont know principle of reading such complex connector, so please if you can draving with red lines path that exist in beep mode... it will help me a lot.

[harp]

This A830L ... https://www.eevblog.com/forum/testge...tery-function/

[eccerr0r]

You'll also have to trace the new DMM more importantly unless you have the schematic for that too, so you'll have practice there too. However the lower right using the two op amps and the transistor is the beeper circuit (one op amp is the threshold, other op amp is oscillator for beeper, transistor for turning the beeper on) and everything else is just a connection to that circuit. The main select switch just connects the beeper in just in the beeper mode else apparently selects the 2KΩ mode. Whether this is applicable or not to the new DMM is the question.

[harp]

I have no schematic, but it looks like bare minimum... so what is another piece of voltage divider, is connecting v+ throug probes, and 100k to ground?

[stj]

try this

[harp]

Thank you, I am not able to ask any question more, dont know how to ask a question that help me future... I search for schematic who contain rotary drawing connector switch (like on yours) and continuity circuit (like on my sch) as well, but not find it... but found a interesting site with plentyfull dmm schematics... http://improwis.com/projects/reveng_multimeters/ Anyway, nothing without opening the dmm before any clue how to approach modification... whats can go wrong, right? (: