hi all
i need a little help if possible with a circuit i am modifying.
the original circuit is a sound to light, activated by an
electret mic, drives 4 LEDS in series and has a VR to
adjust sensitivity. i have breadboarded it and it works.
what i am attempting to do, and i have used a circuit
simulator in which it works, is remove the LEDS and
put a mosfet in to drive 2 X 20W filiment bulbs @ 12v.
on the pic the transistor on the top left is a BC558
original to the circuit the resistor on its collector is
as was (almost) the only addition are the mosfet, bulbs
and the 47K resistor. the theoretical FET is an IRF630.
i have adjusted the value of the resistors to get the
gate voltage right. however i know there is more to
how they function. is this way of doing it correct?
sadly although i can construct from schematics and
have a basic understanding of electronics i lack the
ability to correlate the datasheets information or
understand the maths of it, so im stuck. help would be
much appreciated
Regards
Fenris
i need a little help if possible with a circuit i am modifying.
the original circuit is a sound to light, activated by an
electret mic, drives 4 LEDS in series and has a VR to
adjust sensitivity. i have breadboarded it and it works.
what i am attempting to do, and i have used a circuit
simulator in which it works, is remove the LEDS and
put a mosfet in to drive 2 X 20W filiment bulbs @ 12v.
on the pic the transistor on the top left is a BC558
original to the circuit the resistor on its collector is
as was (almost) the only addition are the mosfet, bulbs
and the 47K resistor. the theoretical FET is an IRF630.
i have adjusted the value of the resistors to get the
gate voltage right. however i know there is more to
how they function. is this way of doing it correct?
sadly although i can construct from schematics and
have a basic understanding of electronics i lack the
ability to correlate the datasheets information or
understand the maths of it, so im stuck. help would be
much appreciated
Regards
Fenris
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