On a quick look, I can't see any caps that need to be much more than
the internal suuply voltage (5V?). The circuit operates a a low side
switch with the positive connected to (internal ) ground which is also
the positive supply.
C1 appears to be the main power supply cap & is the only one connected
to anything close to mains voltage.

I can't quite figure out the actions of D1 & D3. - presumably there is
an internal zener/regulator on chip.

Richard P

On 09/08/05, v01d <v01d@myrealbox.com> wrote:
> Hello all,
> 
> I want to built this circuit (image attached), a single phase AC motor
> soft stater. I got the circuit from Temic and Atmel. It uses U2010B.
> The article gives good explanation about the circuit, also the circuit
> already complete with its components value. What I am missing here is the
> capacitor voltage value. Since it will operated on 230VAC, I think I need
> to consider the proper operation voltage for the capacitors in circuit.
> 
> Does anybody have any experience with this circuit and know what is
> the proper voltage for each capacitor in the circuit?
> 
> Any suggestion for simpler, cheaper, and easier to build single phase
> AC motor soft starter circuit?
> 
> Thank you.
> v01d@myrealbox.com
> 
> 
> 
> 
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