Switching diode, DO-35"/> Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | | | R23, R24, R25, R27 Switch, triple pole double throw, separate symbols | | | Tayda | A-111 | | R9 | 1 | B20k | Potentiometer | | | | Tayda | A-2939 | | | | | | R4, R6, R7 .
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