# Help with diode logic lab

#### dnick6000

Joined Feb 24, 2006
3
I am wondering if anyone can help me with this simple problem. My electronics class had a lab test with this question: Construct a circuit using 5 nopb switches, 3 incandescent 12v lamps, and as few diodes to do the following: pressing switch 1 turns on lamp 1, switch 2 lamp 2, switch 3 lamp 3, switch 4 lamps 1 and 3, and switch 5 all lamps. Seems pretty simple huh. The least diodes I could come up with and work was 4. Just wondering if anyone could do it with less. Any help would be greatly appreciated.

#### hgmjr

Joined Jan 28, 2005
9,027
Here are some examples of simple diode logic functions along with a brief explanation of how they operate.

These examples should reinforce the information that is presented in your course textbook.

hgmjr

#### dnick6000

Joined Feb 24, 2006
3
Originally posted by hgmjr@Feb 24 2006, 07:27 PM
Here are some examples of simple diode logic functions along with a brief explanation of how they operate.

These examples should reinforce the information that is presented in your course textbook.

hgmjr
[post=14349]Quoted post[/post]​

Thanks for the help..Pretty useful info. Many Thanks

#### Papabravo

Joined Feb 24, 2006
20,384
Originally posted by dnick6000@Feb 24 2006, 04:40 PM
I am wondering if anyone can help me with this simple problem. My electronics class had a lab test with this question: Construct a circuit using 5 nopb switches, 3 incandescent 12v lamps, and as few diodes to do the following: pressing switch 1 turns on lamp 1, switch 2 lamp 2, switch 3 lamp 3, switch 4 lamps 1 and 3, and switch 5 all lamps. Seems pretty simple huh. The least diodes I could come up with and work was 4. Just wondering if anyone could do it with less. Any help would be greatly appreciated.
[post=14348]Quoted post[/post]​
Since you have fewer diodes then switches, if one of the switches is connected directly to one or more lamps then the circuit might not work the way you expect.