LIST #4 OF CONSTRUCTED ELECTRIC DEVICES, THE YEARS 2005 - 2009


At this web page I've written down my own constructed electric devices that are in a chronologic order.


Explainations:

E.g. 01/1995 = January 1995
Roman numerals: different in- or outputs. E.g. I, II
Letters: different cases of the same in- or output. E.g. A,B
VAB(0) = a vacant phone line
VAB(1) = a busy phone line
VAB(0R) = a vacant phone line with ring signal
Icut = the value of current at that moment precisely before the current is cut
Ptrans = maximum power of transients
ton = time between input signal and activity
toff = time between input signal and inactivity
tRS = duration of ring signal
T0 = period time
f = frequency
fRTS = frequency of ring tone signal (a tone you can hear in your own phone, while the other
phone is ringing)
V0 = unloaded voltage of output
Veff = VRMS.
Veff = û / (sqrt(2))
û = voltage peak value
Vins = voltage of input signal
Vouts = voltage of output signal
Rin or e.g. 1 Mohms = the input resistance is 1 mega ohms (1 million ohms)
Rout = resistance of device output
FBT = forward-, backward- and time circuits for model trains
Device sizes: - (non-existing device), small, medium, medium-large, large

If nothing else says the main supply is AC 230 V, 50 Hz.


          SOME INFORMATION ABOUT THE
         SWEDISH TELEPHONE NETWORK
   
If you've got a vacant phone line operating in the Swedish
telephone network, the normal direct voltage of that line
has got a value between 48 and 54 volts. Usually you use
lead acid cells as a backup power supply. The cell voltage
is 2 volts in this system. If you've 24 cells, it will be a total
voltage of 2 X 24 volts = 48 volts.
The direct voltage of a busy phone line is 4 V - 10 V or just
0 volts. A normal working phone disconnect the rest of the
phone line.

When your phone is ringing, the ring signal is added to the
direct voltage of approximately 50 volts. The ring signal is
an alternating voltage with a peak value of 95 V - 121 V
(approx. AC 76 V) and its frequency is between 22 Hertz
and 28 Hertz.
At the same time when your phone is ringing, you're able
to hear a ring tone signal in your own phone. This tone has
got a frequency of 440 Hz and also the Swedish dial tone.


References:  Telia AB and of my own experiences
   

Device Constructed Location Some characteristics Size
Ring Amplifier,
type 2C
04/2005 Ängelholm A. VAB(0R)
B. VAB(1).
6 Mohms. Triple tone
Medium
Signal Voltage Divider 05/2005 Ängelholm Rinmin = 100 ohms
ûinmax = 500 V
Divider: 10-5 - 1
Small
Blinking Circuit Device,
one bulb
2006 Ängelholm Bulb: 6 V, 0.3 W.
T0 = 2 s
-
Blinking Circuit Device,
two bulbs
2006 Ängelholm Bulb: 6 V, 0.3 W.
T0 = 2 s
-
Blinking Circuit Device,
LEDs
12/2006 Ängelholm 1-12 LEDs connected in
series. T0: 3 ms - 7 s
-
Ring Relay,
type 2B
12/2006 Ängelholm A. VAB(0R)
B. UAB(1).
ton = 0.5 s, toff: 1-12 s.
2.5 Mohms. 60 W
Medium
Phone Line Indicator,
Back-Up
02/2007 Ängelholm VAB(1). 3 Mohms.
ton = 48 h
Medium
Ring Generator,
type 2
04/2007 Ängelholm A. VAB(0R)
B. VAB(1).
2.5 Mohms. Ring signal.
Vouts = 34 V, T0 = 6 s
tRS = 1.5 s
fRS = 25 Hz
ton = 8 s
Large
Ground Disuniter 07/2007 Ängelholm Vins = 35 V
Rin = 3,100 ohms
Vouts = 35 V
Rout = 300 ohms
Medium
Ring Generator,
type 76 V
09/2007 Ängelholm A. DC 50 V
B. DC 50 V + AC 76 V,
    T0 = 6 s, tRS = 1.5 s
C. DC 50 V + AC 76 V
D. DC 5 V
E. DC 0 V.
fRS = 25 Hz
Large
DC Power Supply 02/2009 Ängelholm 20 V, 3.25 A Medium
EMDR 1 03/2009 Ängelholm I. Vouts = 0.7 V,
   fs = 170 Hz, T0 = 8 s
   ts = 2 s.
II. Se I.
III. Vouts = 5 V,
     fs = 170 Hz, T0 = 8 s
     ts = 2 s.
IV. Se III.
Medium


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