$ 1 32 2.26757369614512E-05 0 5 50 Auto 4032 4608 true

v 480 928 480 864 0 1 667 3 5 0 0.5 
g 480 992 480 1056 0
| 864 832 864 896 2
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r 896 1696 896 1824 0 10000 2
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a 1152 1440 1280 1440 8 0.001 -0.001 1000000
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r 896 1632 896 1696 0 1000 2
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r 896 1472 832 1472 0 100 2
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E 2688 2528 2688 2592 0 75 2 2.192
g 2624 2592 2624 2624 0
g 1056 1472 1056 1504 0
v 576 960 576 896 0 1 770 3 5 0 0.5 
v 672 992 672 928 0 1 852 3 5 0 0.5 
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r 1984 1696 1984 1824 0 10000 2
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v 2528 1888 2528 1824 0 1 1633 3 5 0 0.5 
r 2528 1696 2528 1824 0 10000 2
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x 1216 832 1248 832 17 100 Dual-tone%20multi-frequency%20%28DTMF%29%0A4x4%20matrix%20keypad%20circuit
w 416 2752 3040 2752 0 0 0 0 0
x 544 832 576 832 1 20 DC%20biased%20to%20drive%20opamps