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to understand better driving ultrasonic cleaning transducer a comprehensive guide and project was publish in EPE and Siliconchip based on PIC12F675 as frequency generator and driver you can check it, you also required an Inductor to match resonance frequency of the transducer
Re: LM723 and Variable Current Control Technique????
configuration for LM 723 as a CC/CV professional grade lab power supply also have look to my favorite LM317 CC/CV power supply national app note improved and redesign for better CC/CV control from R.Quan **broken link removed**
if you are new to electronic or have knowledge about schematic diagram then go for video tut at labcenter support web page where you can find tut how to draw a schematic using proteus and how to add source file to it
Fragrance
if the same controller work in old board and not working in new board then must be some the think with new board designing or nay dry joint check out power pin voltage are proper are you using internal oscillator or external oscillator if external oscillator then please check the crystal or cap...
Re: lead acid batteries , desulfation circuits
a nice design published in silicon chip magazine if you google 555 based lead acid batteries desulfation circuit you will find it
CD4543 have latching function so you do not required latch chip, max7219 is also good idea but required a pic interface or Adruino interface there are plenty of example on the web controlling Max7219 with Adruino you can check at sparkfun web page there are display driver using Max7219 you can...
you can used CD4543 BCD to decimal decoder IC provide the thumb wheel out to the BCD input of the chip and connect the 7 segment display to the output of the CD4543
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