Building the MST-13 Timers. Let’s keep going! (HEF 4521BT)

We are getting there! We have a circuit diagram, the Thuring boards, and quartz from COMPONA AG. We now need to buy the “24-stage frequency divider” HEF 4521BT.

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 Photo 6 - DP 124

Magnification of the Togo circuit board. Photo 6 – DP 124

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On 31 July 1985, Lumpert ordered 20 HEF 4521BT from Philips.

DP107-1

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Here is a technical diagram of the device. Notice that O22 produces a signal divided by 2^22 that is 4.194304.

HEF4521

Patience. We are almost done with this project.

Related posts

Building the MST-13 Timers. Let’s get started!

Building the MST-13 Timers. The Thuring Boards

Building the MST-13 Timers. The NYMPH Quartz Mystery

Building the MST-13 Timers. Solving a 30 years Old Mystery.

Reference

HEF 4521 BT Data Sheet

 

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