previous <<==>> next

Electro-Mechanical / Synchron
24 H  "DIGITAL"  ALARM  CLOCK

KUNDO   » 2000 SLR «



... A look inside ...



.. In the middle is a build-in Glow-Light
KUNDO   24H  Electro-Mechanical  Synchron  » D I G I T A L   A L A R M  «  CLOCK
********************************************************************************
» Kundo 2000 SLR «      Kieninger & Obergfell, St.Georgen / Germany       (1970)   

W = 6_1/4" / 16 cm ;   D = 3" / 7.5 cm ;   H = 3" / 7.5 cm

                                 220 VAC / 50 Hz / 2 W  ( ALARM BUZZ ON = 16 W )

Setting with SWITCHES for HOUR & MINUTES  and  WHEELS for ALARM  from the bottom

R E M A R K S :                                               A clever solution!
================================================================================
I found this clock in Berlin FleaMarket and wondered:  How it could have so  BIG
FIGURES  in such  SMALL SPACE ???  -  At home I found the solution:  The DISPLAY
consist of 8 triangular PRISMs (s.Picture 8x3=24 ). On "top" of the figure 15 is
the 23  and on its "bottom" the figure 7.  The working flow ...

                     ->  0     +->   8     +->  16
                         1     |     9     |    17
                         2     |    10     |    18
                         3     |    11     |    19
                         4     |    12     |    20
                         5     |    13     |    21
                         6     |    14     |    22
                       -----   |  ======   |  ------
                         7  ->-+    15  ->-+    23  ->
                       -----      ======      ------

The BUZZER ( the white round in middle of the print board )  is connected over a
BI-METAL-RELAY ( the white block right ):  When the buzz-current made it HOT, it
disconnect the buzzer for a while. After cooling it connect the buzzer again ...
until the NEXT MINUTE switches ALARM OFF.  A switch  on top of the case disables
the alarm by opening the contact ( located left of the big resistor ). 

The  HOUR-WHEEL  and the  MINUTE WHEEL  of the  A L A R M   S E T T I N G   have
contacts. The  HOURS  &  MINUTES  of the  D I S P L A Y  are connected  with the
ALARM-SETTINGS over "SYNCHRONIZED GEARING" to close the contacts when it's time.

                    Have a look at ANOTHER DISPLAY PRINCIPLE
impressum:
********************************************************************************
© C.HAMANN          http://public.beuth-hochschule.de/~hamann           05/23/16