dual-trace scope switch

  
The switcher output goes to the single vertical input of the scope, and a sync line from one of the inputs is taken to the scope's external-sync input. Frequency response of the input amplifiers is 300 kHz over the range of the gain controls.
dual-trace scope switch  - schematic

With the gain controls wide open so no attenuation of the signal takes place, the frequency response is up to 1 MHz.




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