[sdiy] Logic Gate help (Help!)

[Ullrich Peter]

Hi Justin!

The OR can easily be done by adding an inverter on the output of the NOR gate

http://www.play-hookey.com/digital_electronics/images/rtl-nor4.gif 

taken from this page:
http://www.play-hookey.com/digital_electronics/rtl_gates.html 

Ciao
Peter

http://www.ullrich.at.tt


-----Ursprüngliche Nachricht-----
Von: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] Im Auftrag von Justin Owen
Gesendet: Mittwoch, 23. Jänner 2013 17:26
An: SDIY List
Betreff: [sdiy] Logic Gate help (Help!)

Hello,

I'm looking to build a 2x input OR Gate and a 3x input XOR Gate using Resistor/(NPN)Transistor Logic.

I have this schem of a 3x Input NOR: http://en.wikipedia.org/wiki/File:RTL_3-Input_NOR_Gate.svg

1) From that schem, if I remove 1x Input and either Invert the output or take the Q Output from the joined Emitters - does that give me a 2x Input OR?

2) Is a 3x Input NOR the same as an XNOR? i.e. If I invert the output of that schem I get a 3x Input XOR from that XNOR? The truth tables suggests not - but I'm asking anyway.

If not! Anyone got any pointers to a 2x In OR and a 3x In XOR using RTL?

Thanks.

Justin 
  

_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

The information contained in this e-mail message is privileged and
confidential and is for the exclusive use of the addressee. The person
who receives this message and who is not the addressee, one of his
employees or an agent entitled to hand it over to the addressee, is
informed that he may not use, disclose or reproduce the contents
thereof, and is kindly asked to notify the sender and delete the e-mail
immediately.