modified 9 years ago

Fading meter

01:25:02

Need some help please guys.
Want to have an analogue battery meter slowly drop from 9v to 0v after the momentary button is pressed, say 3 to5 seconds.
Is it possible just using smallish capacitors as not got a lot oc room.
Thanks in advance.

published 9 years ago

lmccoig

9 years ago

RC Time Constant T=RC. Voltmeter is not in series with circuit. I did battery to switch to 1 K ohm resistor in parallel with 3 mf capacitor ( RC tank circuit) grounded at bottom. Connect voltmeter to top 9 volt input and back of volt meter to ground. Be aware simulator takes time to show circuit changes. Adjust RC values for timing.

userpro

9 years ago

http://everycircuit.com/circuit/6691725003456512

bfgstew

9 years ago

Many thanks lmccoig, just what i was after, much appreciated.

userpro

9 years ago

https://en.m.wikipedia.org/wiki/Sample_and_hold

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