1 (157)
Strona 18 z 46
Spy Circuits
4. DIFFERENT COUPLING
We have already mentioned the fact that a capacitor can corwert a large waveform with Iow current into a sm; large current.
The following Circuit taps off the inductor at a point of Iow amplitudę to put the least load on the tank Circuit. Tl capacitor has been increased to transfer enough energy at Iow amplitudę.
This coupling has exactly the same result as shown in Circuit 3.
Circuit 3 is preferred as it is easier to connect to the collector than tap the inductor.
6 turns , *
3mm dia y Artenna
O.Smmwire I Ifctacm
Tapping the oscillator tuned Circuit
5. A PNP BUFFER
A PNP transistor can be used in the buffer stage, but as we said before the BC557 is not as good as an NPN operating at high freguencies.
2011-12-08
mk:@MSITStore:F:\spy circuits.chm::/SpyCircuits-l.html
Wyszukiwarka
Podobne podstrony:
1 (150) Strona 11 z 46 Spy Circuits magnetic field" and this occurs when the coil collapses and
1 (160) Strona 21 z 46 Spy Circuits with frequencies around 100MHz. It seems the designer had diffic
1 (181) Strona 42 z 46 Spy Circuits coil. Ali the othertransmitters have sufficient output to detect
1 (149) Strona 10 z 46 Spy Circuits2 TRANSISTOR CIRCUITS The next progressive step is to add a trans
1 (151) Strona 12 z 46 Spy Circuits - 5v for maximum output. The Voyager has been copied by many kit
1 (154) Strona 15 z 46 Spy Circuits To get good audio ampiification, and a stable oscillator and the
1 (159) Strona 20 z 46 Spy Circuits8. CLASS "C" OUTPUT The following Circuit uses no biasi
1 (161) Strona 22 z 46 Spy Circuits There is no evidence of the above Circuit de!ivering morę output
1 (162) Strona 23 z 46 Spy Circuits When you fix these faults you will see how much improvement you
1 (163) Strona 24 z 46 Spy Circuits This covers all the possible combinations for the greatest outpu
1 (166) Strona 27 z 46 Spy Circuits corwert a high-voltage at low-current into a low-voltage at high
1 (167) Strona 28 z 46 Spy Circuits But it is often quite inconvenient to use a long antenna, so her
1 (168) Strona 29 z 46 Spy Circuits A Circuit diagram does not show the screening necessary to keep
1 (169) Strona 30 z 46 Spy Circuits You can learn a lot about designing a Circuit by looking at faul
1 (170) Strona 31 z 46 Spy Circuits This means a certain amount of the energy delivered by the 4p7 w
1 (172) Strona 33 z 46 Spy Circuits AER I AL 1. You don t need 10u and 100u electr
1 (173) Strona 34 z 46 Spy CircuitsTELEPHONE BUG Look at the coil. A floppy coil like this is totall
1 (176) Strona 37 z 46 Spy Circuits junction of the DC amplifier transistor only allowing ,6v to app
1 (178) Strona 39 z 46 Spy Circuits We needrYt say any morę about construction as you will obvious!y
więcej podobnych podstron