photo sharing and upload picture albums photo forums search pictures popular photos photography help login
fotoopa | all galleries >> laser_system > pcb external shutter drive.
previous | next
pcb external shutter drive.

pcb external shutter drive.

How to make 150V from 6xAA batterys? This AVR ATtiny26 controller drive a DC-AC small convertor like used in some old backlight LCD displays. Only a low current is available but this have an effect only the first moment where the elco need charged from 0V to 150V. A extra diode helps to rise the voltage faster to the 8V battery supply. The convertor continue afterwards to the 150V. The 150V is divided to 2.56 V (max = 256V) and connected to de ADC on the AVR. The AVR regulate this voltage between 149 and 150V via the signal CONV. The Shutter is driven by the external CPLD module via the signal SHUTTER. Also an enable signal need to be set (ENA_150V). The signal DELTA_V is not more used and stay at the gnd. Other ADC convertions are done like the battery voltage and reading of 2 potmeter levels (ADC_POWER_LEDS and ADC_IR_SENSOR signals). The potmeters stay extern connected via the FRONT_CON. This give in total 4x8 bit data. This data is send via the SPI hardware from the AVR controller to the MAX II CPLD module. The 2 potmeters give information to the powerleds on the unit and the sensivity configuration for the optical detector system.


other sizes: small medium large original
share
Commenting on this page requires a PBase account.
Please login or register.