TT041: Keutsch Inkjet Driver

Driver for inkjet head.  TipTop1590BB has the Arduino, which does the protocol and timing.  ToprKeutschInkjet has the driver.  Power supply is 24V at 1A, supplied from a desktop switcher.

12-element inkjet head connectors over a ribbon cable to the left.  The jumper block selects which of the 12 elements will be driven/tested.

Because of problems verifying the goodness of the inkjet drivers, there's a test mode.  Press the test button and an LED will display good if it sees a nominal 65-Ohm driver, or the short LED for less than 30 Ohms, or the open LED for more than 120 Ohms.  Then press INJECT to make a full-current 10-usec pulse into the selected element.  Timing is set in the Arduino code.

Arduino code duplicates the original instrument's simple protocol for generating a series of pulses.

The TipTop1590BB build is pretty typical.  No +/-12V regs, no EEPROM:

The topper takes up two spaces.  It has a power driver for the inject pulse, a weaker driver for the test mode, and an instrumentation amp to measure the voltage dropped across the load in test mode.

2021-12

Replaced KeutschInkjetDriver topper with version that supports new head, many more channels: