Author Topic: Need to find SPDT SWITCH  (Read 1173 times)

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Offline dhumxTopic starter

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Need to find SPDT SWITCH
« on: March 25, 2019, 05:37:40 pm »
Hi all, I'm trying to build a project has 2 local osc that generate frequencies on VHF. The 2 local osc must be connected to a SPDT switch, the spdt switch that I would like to have is the one that can be drived by the clock of arduino. Is there any SPDT switch that do the job? I have no idea what switch to use since all the SPDT switch I have worked before are all mechanical.
 

Offline wnorcott

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Re: Need to find SPDT SWITCH
« Reply #1 on: March 25, 2019, 06:12:05 pm »
Have you looked at the CD4053 or its lower voltage variant, the 74HC4053  ?    That is three, SPDT electronic switches on a chip each driven by a logic level signal.

The -3dB frequency is 150-160 MHz so although that is VHF does not cover the entire frequency range of VHF.
« Last Edit: March 25, 2019, 06:18:08 pm by wnorcott »
On very rare occasions, you might notice an odor or see a puff of smoke or sparks vent from your product.
 

Offline Teledog

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Re: Need to find SPDT SWITCH
« Reply #2 on: March 25, 2019, 06:17:55 pm »
Skyworks, among others, make them..kHz to gHz.
Search Digi-key or eBay for  Skyworks spdt
 

Offline Benta

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Re: Need to find SPDT SWITCH
« Reply #3 on: March 25, 2019, 07:14:17 pm »
The 4053 will have major crosstalk/feedthrough problems.
Check Vishay/Siliconix for good analog switches.

 

Offline dzseki

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Re: Need to find SPDT SWITCH
« Reply #4 on: March 25, 2019, 08:51:42 pm »
SN74LVC1G3157?
HP 1720A scope with HP 1120A probe, EMG 12563 pulse generator, EMG 1257 function generator, EMG 1172B signal generator, MEV TR-1660C bench multimeter
 

Offline dhumxTopic starter

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Re: Need to find SPDT SWITCH
« Reply #5 on: March 26, 2019, 02:21:18 am »
My adviser on the project calls it a soft switch, but we do both agree that it is a SPDT switch but idk why he calls them soft switch but when I tried searching for it, all I get is software switch which is not what I wanted
 

Offline rcbuck

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Re: Need to find SPDT SWITCH
« Reply #6 on: March 26, 2019, 03:24:54 am »
I've used the TS5A3159A in the past with good results. It is in a very small SMD package but can be soldered by hand with care. However, it is limited to 100 MHz. Mouser stock them and they are only $0.85 in single lot quantity.
 

Offline pwlps

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Re: Need to find SPDT SWITCH
« Reply #7 on: March 26, 2019, 09:33:12 am »
For VHF/UHF I have used the LMH6570, it is a bit more expensive but is much faster than 74HC4053 or TS5A3159A and has a wider PS voltage range.
 


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