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.
Magnification of the Togo circuit board. Photo 6 – DP 124
On 31 July 1985, Lumpert ordered 20 HEF 4521BT from Philips.
Here is a technical diagram of the device. Notice that O22 produces a signal divided by 2^22 that is 4.194304.
Patience. We are almost done with this project.
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.
HEF 4521 BT Data Sheet
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