Thanks Three! I think I was worried about the HV being just one chip
away from the MCU. I'm not an EE and have never even played one on TV.
I'll go direct, it's easier anyway.
Jonathan
On 1/25/2018 12:59 AM, 'threeneurons' via neonixie-l wrote:
I'd get rid of the 1Ks, and go directly. They
I'd get rid of the 1Ks, and go directly. They are powered, from the same 5V
supply ? Unterminated TTL inputs float to ~1.6V, look like an "iffy"
logic-1. To drag them down to solid logic-0 (0.8V min) requires a "sink"
current of 1.6mA for old standard TTL. A 1K is too big. Unused TTL inputs
