Four-Trace Oscilloscope Adapter
Created: Mar 05, 2014
No description available.
This simple adapter uses an oscillator (LM567) to drive a counter (74HC4017D) and switch (74HC4066D) that selects the output of one of four scope preamps (Q1/Q2 through Q7/Q8) and feeds it to buffer Q9 and output jack J1. J2 provides synch to the scope. R20 through R23 are posting controls for channels A through D (J3 through J6). S1A-B through S4A-B are switched attenuators, one for each channel. Switching rate is about 125 kHz.