"David Nebenzahl" wrote in message
s.com...
On 3/25/2009 5:24 AM David spake thus:

Actually the circuit is not all that unworkable. Some
suggestions and comments:

Check the updated schematic, incorporating your
suggestions:
http://www.geocities.com/bonezphoto/...e-shotBell.gif

Let me know what you think.


--
Made From Pears: Pretty good chance that the product is at
least
mostly pears.
Made With Pears: Pretty good chance that pears will be
detectable in
the product.
Contains Pears: One pear seed per multiple tons of
product.

(with apologies to Dorothy L. Sayers)

OK the circuit is better. R3 will also discharge C2 which is
also necessary to allow the circuit to start another cycle.
The surge resistor should be in the low 10s of ohms and
probably about a watt. If the load is in the 100-200mA range
than just size the R2 resistor as needed. Remember that the
voltage across C2 will be close to 150v. I would put a Zener
diode across the load to prevent voltages going above what
your annunciate device can handle safely. Remember that this
entire circuit is at line voltage and anything connected can
be a severe shock hazard.

David