T&L Publications

Failed spam attempt?
OP didn't know how to put in a link?

What do you consider "long range"?

If you need a calculator for the LM3914, there's plenty on-line.

I hope I did it right and am done.

For example, LT1084 sheet says 10 mA minimum load and Out to Ref is 1.5V. A few clicks on Windows calculator I had resistor values.

((R1 may need to be 9.31 kΩ instead of 14.7 kΩ.))

Cheers,

LT1084 spec sheet https://www.mouser.com/datasheet/2/609/ ... 269789.pdf
Could somebody double check my numbers please.

dacflyer, should keep you busy for a bit.

Cheers,

If it looks okay, I'll go to spec and recalculate the resistors.
Unless you want the fun

dacflyer wrote: ↑Tue Dec 06, 2022 4:13 am Most likely stay on all the time...

Short time I would have suggested two 9V batteries in series through a momentary contact switch to pin 3 of LM3914.

Full time calls for a voltage regulator from BUT (battery under test). I'll modify image from post 1 and come back.

Cheers,

Will this stay connected to battery full time and continuously on? Or with a momentary "on" switch?

Actual spec sheet
https://www.ti.com/lit/ds/symlink/lm3914.pdf

max supply is 25V and measure input(s) protected to 35V.

Regulate supply to 15V - 18V. Voltage divide input by 2. That will give a 26V high end input, while staying safely away from IC maximums.
(half of 26V is 13V)

Cheers,

who in Dubai would be buying a bottom tier GM vehicle anyway?

If it is like Kuwait, the foreigners who are in-country to do the dirty jobs for more than they could get in their own country.

Cheers,

Sorry to rain on your parade, but progress probably prevents doing it. No more volume potentiometers, the circuit you need to tap into is inside a big chip, even the audio line(s) to the power amp chip could be a trace inside a multi-layer board. If you find something that works on modern TVs, let u...

At least most of the spam has come to a halt...

Not really, just removed before you see it!

How large is the file? Number of sheets in file?

I think you mean varistor, AKA MOV (Metal Oxide Varistor).

A varactor is a diode whose capacitance is adjustable by applied DC. Used in radio receivers.

Cheers,

What is the amplifier plugged into?

How can you tell if it's in the 120VAC wires or is it RF in the air? The noise is unlikely to come on AC lines and get through the amplifier's power supply. So RF through the air. BUT , the AC lines are a transmit antenna. The audio connecting cables (if any) and circuits in the amplifier are the r...