Fiber phototransistor Q1 recieves the input signal. It recieves its DC bias through R1(3.9k). Since the wire impeadance and the tap arises problems to signal reception a simple one-transistor amplifier has been added. The amplifier must be configured for the frequency being tapped. This is done through two 5k pots to replace the standard resistors so the device is re-useable. After amplification the signal is sent through the 10k:600 Transformer loaded by R4. The output signal through labeld leads 3 and 4 are connected to another fiber LED to be sent to the mux and recorded. From T1(note to antionline that this is the transformer) the signal should go through a buffer to remove static and further enhace the signal, unfortunately I do not have access to such a schematic so a overly strong signal should suffuce.
Parts include
2 fiber leds (Motorola MFOE71 Ir leds in coupler)
1 fiber phototransistor (Motorola MFOD72 IR in coupler)
2 5k pots or 2 tested resistors
resistors
1 10k
1 3.9k
1 1.2k
capacitors
3 .1 uF coupling
22 pF ceramic
10 uF aluminum electrolyte or tantalum
600:10k trans (Mouser p/n 42TL019)
battery, electronic cutter, pc board..etc.
this is directly from my notes, this stuff comes from a few electronic books such as the amplifier from 'The Encyclopedia of electronic circuits' I'm not sure what volume but I only have the first two. I used 'The Circuit Designers companion' for the layout with some help from a published author(paladin-press) when he was doing an IRC discussion forum.
I will not post the schematics because
1. it will look like crap similar to the old phreaking manuals and
2. I don't want anyone to go around hacking up T1s and it leading back to me
Disclaimer
I am not responsible for anything, including my own actions.
