Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Urgent:Digital AC/DC Test meter

Status
Not open for further replies.

henry77

New Member
Hello friends,

I have to design a test meter, which should measure DC voltage from 0-50v, and should measure input AC Signal (800hz to 500khz, upto -40dB). the output should be displayed on 3 1/2 digit LED Display.

for DC part of measurement i am planning to use ICL7107 which is ADC with LED driver IC , but i am confused for AC measurement. as i want dB level of signal to be displayed, sO plz guys help me out with your suggetions

thanx
 

dougy83

Well-Known Member
Have a look at the SSM2166 (mic amp with variable compression & noise gate) IC. Given an AC signal, it outputs a voltage (on AVG CAP) proportional to the logarithm of the rms value of the signal (plus an DC offset). You should be able to feed this voltage into your DC meter after appropriately scaling and shifting it.
 
Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading
Top