[Amps] QSK-5 and QSK-1500 etc.

[2 at vc.net (2)]

>Regarding PIN DIODE QSK devices...
>
>Does anyone have any old articles on how to build such devices?
>
>I occasionally see that Design Electronics QSK-1500 unit. Are they any good?
>
>I would like to go QSK on a small ampifier but can't see spending $350.00 
>for the privilege (grin!)
>
?    It can be done for c. $60 using high-speed relays and an opto-isolator.