On 11/22/18 2:16 AM, Peter Voelpel wrote:
Me too.
I use synchros in three of my rotators, one HyGain and two homebrew.
At the moment I coupled a helipot mechanically to the receiving synchro for
presets and end of travel switching.
Synchros are still available on Ebay and military surplus shops so I will
continue to use them whenever I need a direction indicator but would like to
transfer bearing data to my contest program.
Hans, anymore info about the IC types and the application you are aware of?
Analog devices
https://www.analog.com/en/products/ad2s44.html
AD2S44 "Low Cost 14 bit, dual channel synchro/resolver to Digital
Converter"
Hybrid 32 pin DIP, $2,202.27 from them.
Uses an internal solid state Scott-T to turn V1,V2,V3 into sin/cos
resolver, and then converts it using a form of PLL.
https://www.analog.com/en/products/ad2s90.html#product-overview
The AD2S90 is a 12 bit resolver to digital converter. It *is* a lot
cheaper ($35)
You'd need a Scott-T to make this work with a synchro
The big problem is that the excitation frequency has to be between 2-20
kHz. and it wants to see 2 Vrms on the input - you can probably run a
400Hz synchro on 2kHz.
https://www.analog.com/en/products/ad2s83.htmle
this $80 unit is also a resolver-digital, so you'd need a Scott-T. It
does have a minimum frequency of zero
DDC (http://www.ddc-web.com) is a supplier of synchro/resolver to
digital for decades.
It looks like they have a RD-19242 monolithic resolver-digital converter
http://www.ddc-web.com/Products/281/Default.aspx
no price info..
The data sheet does have a suggested resistor network you can use to do
synchro to resolver conversion
-
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