25-03-2022, 02:04 PM
Should be fine, CD4521 is Texas Instruments as against Philips for the HEF4521.
The board may even work without it, depending on the Drive used, as it is just a head load delay circuit and some drives have the head loaded all the time.
Ernest
The board may even work without it, depending on the Drive used, as it is just a head load delay circuit and some drives have the head loaded all the time.
Ernest