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My version of popular "Amplipulse" phisiotherapeutic device. Of course user safety is not guaranteed.
Device particularity in that it allows to assign current painlessly by the reason of use 5kHz sinusoidal carrying wave.
article about more complicated such type device -...
Hello.
both transformers (for gate driving and power) is taken from PC power supply (built as half-bridge circuit). power transformer without any changes, gdt rewinded.
of course also it is possible to use pc psu as is with native pwm controller substituted with mcu.
dedicated as controller for toys or other not strong locks.
controlling sequences :
ENTER,ENTER for switch to lock condition,
BACKSPACE for input code correction,
BACKSPACE,ENTER,BACKSPACE,ENTER in unlocked condition for edit key mode,
ENTER for code termination.
also separate button available...
Thanks, Zuisti. that is not hard when interesting.
several words about pushbuttons keyboard - automotive foam tape over button pusher is useful for additional softness.
that is in two version - with touch sensor grid keyboard and with pushbuttons keyboard.
for the rest they similar - (double) variables for calculation, 15 stage for stack, 20 memory registers (also stored in eeprom),
some place for 3 microprograms in eeprom, small amount of built-in...
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