How to configure Horizontal Boring mill

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20 Jan 2023 18:34 #262512 by yrsiddhapura
@andy i seen a thread where you give suggest to photos.app.goo.gl/cFtC9m7CeLSKASAa7 as pwm potentiometer which quite interesting but could you suggest voltage value for 1uf capacitor and watt value for 1k resistor

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20 Jan 2023 22:25 #262526 by andypugh
At least 10V for the cap (I would use a 30V I think) and the power through the resistor can't be more than V^2/R = 0.1W.
Looking at a random VFD online, that has an input impedance of 30k, so the current through the 1k resistor is a max of 30uA and a power dissipation (I^2 x R) in the 1k resistor of 0.0001W.
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21 Jan 2023 15:05 #262584 by yrsiddhapura
So 10k 1/4 resistor good to go with this circuit

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23 Jan 2023 16:50 #262749 by andypugh
You want a sensible RC time constant. (Just multiply the capacitance and resistance together (remembering the prefixes) and the answer is the response time in seconds.
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24 Jan 2023 08:39 - 24 Jan 2023 08:41 #262803 by yrsiddhapura
Ohw sorry It was typing mistake what i mean is 1k 1/4 watt resistor (not 10k 1/4 watt) would good to go ?

I had ordered acpl-p480 would take about 3 week (as not available in Indian retail market)
Last edit: 24 Jan 2023 08:41 by yrsiddhapura.

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