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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
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14th Mar 2018, 9:44 pm | #1 |
Heptode
Join Date: Jan 2008
Location: Hakadal, Norway
Posts: 643
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KTAS telephone with counter D30
The Danish KTAS D30 for use on UK telephone sockets. And with a working counter.
For those who has more than one telephone connected the use modification of phones may be important. In this setup it is important that the voltage is 48V and the polarity is right due to the counter circuit addon. (yellow on diagram) Else the hoo switch need to strap the capacitor/resistor. The most easy way is to solder a strap on the hook sw. The other side of the ringer should be located, cut and spliced with the ringer wire (Blue) The values of the components in yellow is designed for a 48V system, and still it will take several minutes to charge the capacitor. When the capacitor is charged, a person will try to call, and the first digit lets the counter count one more. |
14th Mar 2018, 9:46 pm | #2 |
Heptode
Join Date: Jan 2008
Location: Hakadal, Norway
Posts: 643
|
Re: KTAS telephone with counter D30
It took 7-8- years to find answer :-( But this has had a thread: https://vintage-radio.net/forum/showthread.php?t=60645
dsk |