LIST #2 OF CONSTRUCTED ELECTRIC DEVICES BEFORE 2005


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
Mains Transformer 01/1991 Vejbystrand Output:
I. AC 25 V
II. AC 7 V
70 VA (I and II) 		Medium
DC Power Supply 08/1991 Vejbystrand I. 0-30 V, 2 A
II. 5 V, 0.4 A
V-meter (I) 		Large
RC Oscillator 10/1991 Vejbystrand Output signal:
f: 2-82000 Hz
Veff: 3.5 V
P: 0.4 W 		Medium-large
DC-DC Converter 1993 Vejbystrand Input: 12 V
Output: 0-11 V, 0.65 A 		Small
Christmas Lights
Power Supply 		1995 Vejbystrand V0: DC 3-16 V, 3.5 A Medium
Ring Relay 1995 Vejbystrand VAB(0R)
ton = 0 s. toff = 1 s 		Medium
Ring Amplifier 07/1997 Vejbystrand I. VAB(0R)
II. VAB(1)
2.3 Mohms (II). Bell 		Medium-large
Ring Amplifier 11/1998 Vejbystrand I. VAB(0R)
II. VAB(1)
2.3 Mohms (II)
Triple tone 		    -
Ring Generator 11/1998 Vejbystrand Output signal:
AC 0-42 V, 9 W
A. 25 Hz, B. 50 Hz 		Medium
Phone Line Indicator 02/1999 Vejbystrand A. VAB(1)<>0 V
B. VAB(0R)
Battery. 1 Mohm
Output signal:
red LED 		Small
Phone Line Indicator,
type 2 		03/1999 Vejbystrand A. VAB(1)
B. VAB(0R)
1.1 Mohm
Output signal:
yellow LED, blinking (B) 		   -
Phone Line Indicator,
type 3 		03/1999 Vejbystrand A. VAB(1)
B. VAB(0R)
1.1 Mohm
Output signal:
yellow LED, (B) 		Small
Phone Line Indicator,
type B 		03/1999 Vejbystrand VAB(1). 2.2 Mohms Small
Phone Line DC
Generator 		04/1999 Vejbystrand Output signal:
A. DC 49 V
B. DC 9 V
C. 0 V 		Small
Ring Relay,
type 2 		04/1999 Vejbystrand A. VAB(0R)
B. VAB(1)
ton = 0.5 s
toff: 0.5-12 s. 2.3 Mohms 		Medium
Phone Line DC
Generator,
type 2 		05/1999 Vejbystrand DC 49 V Medium
Frequency Counter 09/1999 Vejbystrand Microphone: 20-14000 Hz
Signal: 1-39999 Hz 		Medium
Phone Line
Indicator,
type blinking 		10/1999 Vejbystrand VAB(1). 10 Mohms
Output signal:
A. red LED
B. red blinking LED 		Small
DC Power Supply 11/1999 Vejbystrand I. DC 5 V, 2 A
II. DC -5 V, 2 A 		Medium
Light and Darkness
Indicator 		11/1999 Vejbystrand Output: AC 230 V,
1700 W		 Medium
Phone Line
Indicator,
type blinking 2 		11/1999 Vejbystrand VAB(1). 10 Mohms
Output signal:
A. red LED
B. red blinking LED 		Small
Ring Amplifier,
type 2 		01/2000 Vejbystrand A. VAB(0R)
B. VAB(1)
5 Mohms. Triple tone 		Medium
Battery Adapter 04/2000 Klippan DC 9 V, 0.2 A Small
Two Timers, which
each supplies an
engine 		06/2000 Klippan Output signal:
I. toff = 18 s
II. Se I
DC 24 V, 0.6 A 		Medium
DC Power Supply
for a clock 		07/2000 Klippan DC 24 V, 1 A Medium
Mains Voltage
Devider 		08/2000 Klippan Output:
I. AC 0-115 V
II. AC 0-230 V
50 VA (I and II) 		Medium
A circuit with a bell
in the waiting room 		10/2000 Ängelholm V0: DC 28 V, 55 mA Medium
Devider and
Amplifier of
Signal Voltages 		12/2000 Ängelholm Devider: 10-6 - 10-1 times
Amplifier: 10 - 10000 times 		Medium
Time- and Backward
Limiter for Model
Trains 		12/2000 Ängelholm Vins: DC 22 V
toff: 2-3.5 min.
Vmin = -12 V 		Medium
Wire Identifier:
receiver 		04/2001 Ängelholm Wire #1: 1 LED is lit --
Wire #10: 10 LEDs are
lit. Battery 		Small
Wire Identifier:
transmitter 		04/2001 Ängelholm 10 wires and ground.
From 2.50 V to 4.75 V
by steps of DC 0.25 V.
Battery 		Small
Red Phone Line
Indicator Lamp 		05/2001 Ängelholm VAB(1). ton = 0.7 s
toff = 16 s. 2.2 Mohms 		Medium
Time- and Backward
Limiter for Model
Trains 		05/2001 Ängelholm Vins: DC 15 V
toff: 2-3.5 min.
Vmin = -8 V 		Medium
FBT - Limiter 06/2001 Ängelholm Ins: DC 22 V
I. -42%, 170-190 s
II. se I 		Medium
AC Power Supply
for FBT - Limiter 		07/2001 Ängelholm AC 15 V, 0.17 A Medium
Battery Adapter 07/2001 Ängelholm DC 9 V, 0.25 A Small
Ring Generator
for two phones 		09/2001 Ängelholm I. (A. DC 49 V, B. DC 5 V,
C. DC 49 V + AC 35 V)
II. Se I
tRS = 1.5 s. T0 : 6-7 s
fRS = 25 Hz
fRTS = 300 Hz 		Medium-large
Ring Amplifier,
type 3 		10/2001 Ängelholm A. VAB(0R)
B. VAB(1)
2 Mohms. Floating tone 		    -
DC Power Supply 11/2001 Ängelholm DC 24 V, 1 A Medium
Phone Line Indicator,
type C 		12/2001 Ängelholm VAB(1). 1 Mohm Small
DC Current Supply 01/2002 Ängelholm Output: DC 22 V, 4 A.
Overload protection:
Icut = 4.5 A.
Transient protection:
Ptrans = 1800 W 		Large
DC Power Supply 01/2002 Ängelholm 0-100 V, 0.1 A.
V- and A-meter 		Medium
Adjustable and
Protective
Transformers 		04/2002 Ängelholm I. V0: AC 0-260 V, 2 A
II. V0: AC 0-160 V, 0.5 A 		Large
Time Limiter for
Model Trains 		06/2002 Ängelholm toff:
I. 0-9 min.
II. Se I 		Medium
Ring Amplifier,
type 2B 		11/2002 Ängelholm A. VAB(0R)
B. VAB(1)
5 Mohms. Triple tone 		Medium
DC Power Supply 02/2003 Ängelholm Input: AC 115 V
Output:
DC 6-15 V, 60 mA.
Rechargable batteries 		Medium
DC Power Supply 03/2003 Ängelholm I. DC 8 V
II. Se I
1 W (I and II) 		Medium
Twinkling Christmas
Lights 		06/2003 Ängelholm 5 X 4 bulbs á 12 V,
75 mA		 Medium
Mains Voltage Device 09/2003 Ängelholm AC 230 V, 1 A.
V- and A-meter 		Medium
DC Power Supply 01/2004 Ängelholm Output:
DC 12.7 V, 0.18 A.
Is able to replace AC 9 V 		Small
Voltage Measuring
Device for Voltage
Meter 		06/2004 Ängelholm Voltage range:
A. 5-30 V
B. 0.5-3 V 		Medium
Battery Charger 07/2004 Ängelholm DC 6 V, 1.2-10 Ah Medium
Testing Device 08/2004 Ängelholm Output:
I. DC 12 V
II. A. 12 V, B. 0 V
III. A. 0 V, B. 12 V
DC 2 A (I, II and III) 		Medium-large
Phone Line Indicator,
type D 		09/2004 Ängelholm VAB(1). 1 Mohm Small
Phone Line Indicator,
type E 		10/2004 Ängelholm VAB(1). 6.8 Mohms Small
DC Power Supply 11/2004 Ängelholm Input: AC 115 V
Output: DC 6-15 V,
80 mA 		Medium
Menu of Links
Göran Holbeck's Website