ronv Well-Known Member Most Helpful Member Dec 5, 2011 #1 I want to build a wireless charger for my wireless mouse. I found a nice writeup here. **broken link removed** The author used mica caps, but they are expensive. The question is can I use a film capacitor in place of the mica one or do I need to worry about the dissipation factor in the cap running at 125KHz. ?
I want to build a wireless charger for my wireless mouse. I found a nice writeup here. **broken link removed** The author used mica caps, but they are expensive. The question is can I use a film capacitor in place of the mica one or do I need to worry about the dissipation factor in the cap running at 125KHz. ?
crutschow Well-Known Member Most Helpful Member Dec 5, 2011 #2 Film capacitors should work fine at 125kHz as long as the voltage rating is adequate.
alec_t Well-Known Member Most Helpful Member Dec 5, 2011 #3 You could try a film cap, with the circuit supply initially at a reduced voltage. Switch off and immediately test for warming of the cap. If no problem, repeat with successively higher supply voltages.
You could try a film cap, with the circuit supply initially at a reduced voltage. Switch off and immediately test for warming of the cap. If no problem, repeat with successively higher supply voltages.