Adding a bit more...
Capacitive reactance (its "resistance") Xc = 1 / (2 * Pi * F * C)
So swap round Xc and C to be able to work out the capacitance required
for a required resistance. For me in f = 50Hz land, Xc = 10k gives
1 / (2 * pi * 50 * 10000) = 0.00000032 = 0.32 uF - so I would start with
a 0.33uF standard capacitor, a PET type perhaps.
About the resistor required across the capacitor. The capacitor can hold
a charge when the circuit is switched of. Sufficient to charge give an
unpleasant shock. Use a 1M resistor across the capacitor to dissipate
the charge. Make sure you use a resistor with sufficient voltage rating
- usually it will be a 0.5W part to get this. Cheap Chinese capacitive
droppers often use a 0.125W part which will not have the required
voltage rating.
Hope this helps, Grahame
On 17/01/2021 03:44, gregebert wrote:
At 60 Hz, a 0.27uF capacitor has 10K ohms of impedance. You would need
to use a non-polarized cap that can handle the ripple current,
something under 12mA.
I cant vouch for how well that will work; it's a non-linear circuit so
the capacitor is not exposed to a steady sinusoidal waveform, so it's
effective impedance is probably much different.
If I have some extra time, I'll run a SPICE simulation.
On Saturday, January 16, 2021 at 6:41:38 PM UTC-8 [email protected]
wrote:
We all know the flickering flame candle bulb (if you don't, what
are you doing here?)
I was wondering if there's a way to get this to glow stable.
So I removed the base and found a 30K 1/4W resistor in there (230V
model)
I replaced this with a 10K 1W model to see what would happen.
Well, things happened...
It was glowing way more intense but still flickering and after 5
minutes or so I noticed the rich bouquet of brûlante resistance
(the resistor was melting and you know the smell...)
So I contacted a certain YouTuber for advice and he told me
perhaps it would be possible but I need to use a combination of a
resistor and a capacitor (with discharge resistor across it) to
get higher current with less heat a combination.
All good advise (I guess) but I have no idea about capacitor
values etcetera.
Can anyone help me in the direction to solve this?
Thanks in advance
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