Andy,
Sorry, my title for the thread was very ambiguous.
Thanks much for the info on the stepdown switcher used for the digital
circuitry.
>From a previous post by Sean (specific to the SB2)-
Code:
--------------------
AC -> 5V 2A -----> Dual ----> 3v3 (IO, wireless, logic)
SMPS | Switcher ----> 1v2 (CPU core)
|
|----> Linear reg ----> 3v3 (headphone)
|
|
|----> Switcher ----> Multiplier -----> 11VAC VFD ef
| |
| |
14VDC | |-------> 55VDC VFD vdd2
----------RC filter<-----|
|
|
|------> Linear reg ---> 9vdc (op-amps)
|
|------> Linear reg ---> 5vdc (DAC)
--------------------
What I was actually inquiring about was the 'switcher' that feed the
multiplier (Cockcroft-Walton) which generates the 11vac and 55vdc (for
the display?) and the 14vdc which is decoupled by that bigass(tm) cap
and ultimately the linear regulators feeding the dac and opamp. My
question was how is that specific 'switcher' implemented, i.e. a
multivibrator? and at what frequency and duty cycle?
Sean - Would you please enlighten?
Thanks,
Paul
--
occam
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