VR to Hall Converter

An (LM1815) VR to HALL interface and a (HC4024) counter chip in a small DSUB9 connector housing. Requires 5V supply (from the assembled v3 controller EC36/28 pin, or other source, only appr. 10mA needed) The LM1815 (adaptive hysteresys threshold VR interface chip, the adaptive input mode can be configured in 3 modes with simple solder-blob) output is available, normally low level, outputs 1 short (less than 100 usec) high-pulse at the negative-going zero crossing edge of the input pin. Useful for using VR (crankpos, campos or wheelspeed) sensors when the ECU (or other device) is equipped with HALL signal input. The output of LM1815 goes to 4024 counter / frequency divider. This divided output (divby8) is useful for ABS wheels that have more than 10 pulses per wheel rotation. The reset input signal of the 4024 is available on the DSUB9 pinout (can be used as prohibit signal to reset the counter, keep output low). Normally the divided output is only useful for wheelspeed signal, not for