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Hi,
First of all thank you !
Regarding (1):
It does sound (and look) like a cap is discharging somewhere in the meter. It happens only on the AC features. If There is a leak somewhere I have no idea where to find it.
Measuring AC is different than DC. In addition to what you already said, This...
Hi,
I need some help repairing a Fluke 87 (I) multimeter.
I bought a second hand Fluke 87 on E-Bay a few days ago.
15A Fuse was blown.
Fluke works fine in general, But when I turn on AC measurements (all - Volts, Amps/milliAmps , uAmps) I get a "ghost" reading of three right digits that start...
@ard: I think I need a solid state solution.
@alexan_e: PGA is a nice way to go. i'll give it a look. I hope I'll find these chips around where I live.
@FvM: I am not sure (it does say current switches) but i'll look into it. It's still funny no "simple" solution to such a trivial request...
Thanks!
The PGA2311/4311 look like a nice solution. I'm not familiar with these. I wonder if these could solve my other requirements also. I did not find any current limit specification in the datasheets, but these ICs have short circuit protection (@50 mA) so I wonder if this will cover my...
Generally I'm trying to achieve three goals:
1) Using Voltage control resistor for micro controlled power supply
2) Using it to control the xr2206 function generator chip. (referenced in the "broken" post...)
3) Using it to control volume in an audio amp.
Thanks again betwixt,
In it, alexan_e suggests using a digital pot.
Do you, (or anyone else for that matter), know of a digital pot that can sink anything in the vicinity of tens of milliamps ?
Using a mosfet as a voltage controlled resistor...
again, thank you.
I've tried using a Mosfet before posting my first post.
It seems a Mosfet is even less linear than the LED/LDR combination (this is why I liked the solution).
I'm trying to control an XR2206 function generator using a...
Thank you betwixt.
I have tried fiddling with a few LDR led and optocouplers yesterday as you suggested. i still have a few problems.
1) I can't bring the resistance low enough. (stays at around 1k ohm). I need it to go lower.
2) Resistance doesn't seem to behave very linearly.
I did love the...
Hi,
I'm looking for the easiest way to modify the resistance between two points in my circuit using a picmicro.
I need to build a power supply and frequency generator, and these two circuits are based on a potentiometer originally. I cannot change the circuit and I don't need voltage output but...
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