TTL signal to NIm signa??

Question

hi guys out there,need help

from http://lyoinfo.in2p3.fr/cms/cmsecal/TTL_NIM%20user%20manual_v10.pdf

page 6, we could see how to convert an TTL signal to NIM signal,anyhow, there is a -6V to be connected to the bottom of the circuit. How to generate -6V?function generator?or Ac source? Beside that, i think the entree is input in English (french document...), input for TTL is what?another 5V from function generator or Ac source? Output should be Oscilloscop rite?

I;m currently doing an project regarding how to convert TTL signal to NIm signal, and using MULTISIM to do the simulation before doing in practical. Thanks for helping hand!!!

Answer 1

Since this (French) circuit is in an actual NIM module, there is a negative power supply rail available on the back NIM connector. It may have to be regulated down from -12 volts (for example), but there is usually some negative power available in the NIM crate (provided you order the power supply with a negative rail).

If you want to build a stand-alone circuit, I suggest you use a voltage inverter (i.e. Maxim MAX889 or other equivalent products from TI, National, Linear Technologies, etc.) to generate your negative 6 volts.

http://datasheets.maxim-ic.com/en/ds/MAX889.pdf

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Answer 2

The actual circuit is on page 11. The input is TTL and the output is NIM.

To generate -6V DC, connect four 1.5V batteries in series. Then connect the positive to ground. The negative is now -6V. Any supply can be connected backwards, as long as it is not grounded inside. Usually, a switching power supply is used, like in a computer.

TTL is transistor transistor logic, which was common at first because transistors were more common. In practice it means the voltage levels are as shown on page 4. So TTL can be generated with any switch or resistor to the correct voltage.

Answer 3

You can use L7906 regulator to generate -6Volts just as LM7805. the only difference is that in 7906 Pin1 is gnd, 2 is input, 3 is output.

you can also use LM337 based variable negative supply using variable pot.