LIST #4 OF CONSTRUCTED ELECTRIC DEVICES, THE YEARS 2005 - 2009 |
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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. |
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SOME INFORMATION ABOUT THE SWEDISH TELEPHONE NETWORK |
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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 |
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| 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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Menu of Links Göran Holbeck's Website |
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