Rotary switch single button replacement

Y

ymmy

New Member

• Jan 8, 2005

• #1

Guys, anyone can help to desing simple 2 or 3 pole like rotary switch replacement done on single IC preferably CD40XX or 555 powered from 5V. I need select 2 or 3 different Crystal Mhz so it should work like 3-pole mechanical rotary switch.
Thanks

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Jan 9, 2005

• #2

ymmy said:

Guys, anyone can help to desing simple 2 or 3 pole like rotary switch replacement done on single IC preferably CD40XX or 555 powered from 5V. I need select 2 or 3 different Crystal Mhz so it should work like 3-pole mechanical rotary switch.
Thanks

Click to expand...

I wouldn't have thought the cmos switches would be very good for switching crystals - what are you trying to do?.

 

Y

ymmy

New Member

• Jan 9, 2005

• #3

Hi Nigel, i’m just trying to get rid of mechanical switch in the part of schematic attached below. Would be even better if possible to select 3 different crystals since I’m going to add one more if possible…

 

Attachments

• crsw.jpg

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R

Russlk

New Member

• Jan 9, 2005

• #4

I don't know any IC for that function, normally PIN diodes are used. Just turn the diode on for "ON" and reverse bias it for "OFF". I think M/ACOM is out of business now, but they made a 3 diode switch: MA8334-004.

 

Sebi

Active Member

• Jan 9, 2005

• #5

As i see, You use 2input NAND gate. Why not build two or three oscillators and enable/disable with other input...

 

Attachments

• crsw.gif

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R

Russlk

New Member

• Jan 10, 2005

• #6

I found a Texas Instruments chip: SN74CBTS3306, which is a DPST bus switch. Also, NJR makes a photo pin diode, which would be ideal for this application.

 

Y

ymmy

New Member

• Jan 11, 2005

• #7

Thanks guys, I’ve decided to go with ordinary 5v relay and micro push button.