HWPeeler (HPeeler)

hobby electronics

Hosted by HWPeeler (HPeeler)

A forum for people who enjoy electronics as a hobby.

  • 72
  • 162
  • 4


Industrial time base generators, MC14566, 7457   Digital

Started Apr-8 by HWPeeler (HPeeler); 59 views.
HWPeeler (HPeeler)

From: HWPeeler (HPeeler)


In microprocessors taking 60 Hz and getting one pulse per second is done in software. Before microprocessors there were time base generators that did this in hardware. For 50 or 60 Hz in CMOS there was the MC14566. In TTL there was the 7456 for 50 Hz or the 7457 for 60 Hz. The 7456 and 7457 are the only older TTL devices in an 8-pin package.

New designs? No. These are ancient chips. The information is noted here for techs that have to repair this era technology. I found them in an industrial car washer.


If you find a place state-side that still sells these chips please let me know.

HWPeeler (HPeeler)

From: HWPeeler (HPeeler)


"Membership required", but thanks anyway.

I don't buy in high enough quantities for most distributors like these. I put in bids and get ignored.

(edited  to add ...)

I put in a bid for 10 and got an answer of $15.00 each.  Tuck that!