測試圖

http://www.falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWKsDMKAcAWAbAzAmBMSbAdgMJExRCQUloFMBaMMAKACcQVJNww+Hn3D50UZPBTt8kAJzD+g8byXYGG2PEgQU0fHMNFI6NuXQILPaDT3SAZiDnYQ2JWNf8UQvUJhwObjBSFzYhMDlwwQl-OGlZBQiooXx8JWjNbUghTGgIwwKC9DlSdBQkXJz9Lk8QdAY3JxcGYkh2ABMeZK66hiF2xnsAQwBXABsAFxl5EGZvWob+TO0q-MLDdDJBCV0qau5mRsbmTHFG5chpAHdFAR8RU6h2G9UqcWU3p5eRMHVb1KWz3AITutTCXzB0Xm4LaLyE9R65yBi0RgLhtSOaNm82OjyRNw+CI+YEwWMO-GO4PxtQRmIhdOcCyBjSp-EZsNqsjOSki9LUDEZvw0zKUIJZfw55PAf2YgolQOJII+XIhc3CMseQoh0L+4uFNxafx1+p6wRcxr5IBV8xVHOVJk5DraBz1s01EskcWmCjV0o0fpiWng4RsaDc6FkpRM2E2-Eqe3wHR61vCIP6g1GkxqLLFPL84Dg7EccpaHi1818no4xfNKFCHjDPUrsUCtXKQkadfELULnQrWCbCBSIAGw3GUwS2J8dYkjYucD80GwZD4cnb2VIsko8cqNSljZOKhnF2uohUA87A45l68PivQIrQ6bx+RPBnFZf6Mbnc-U7fLkPf8IQ+dszx4e8bn3GdZVrZoRR4J8fzgm4kKaIDry8C8vBjS0xG5K1N1wzABRcNITUaQgXAo4jVWohhWGiMjgI8SiwO8E1fSYwCmI5G0aLoiE+hoviTRtBBzRSGiMKtdAVBSWTgLTBSKIU3iREbV5iNEkQATA3S1P4PD-jSJ4XUMmjuKkz1Lm9P8eKtKzYmDPY1nWTZTHwGgd2qPt5Lkq1xKtEcM3HbNDMCijCJ7NpJySGTxF0oz52yFz1kKdBSHKBMExqM14vAXkkushw0KY5VhJ8XYW1s15avU49rICWYYGIHASgQchiLkCwY1sHgaleIy6qWYqFRYh1lRMtoa1oaIPiIHxKsXAIwtoDxGjwEbWiTeZxIYXaWOCscs0nX0Fokc7ksXDrxIMFAQg69Q1wgbzEzM2ahEAy7RoJDw9tqf7pP+3b5XRId-Mu19zt2jIHyEc6NthyCYc+x5Id+8RwbAwGgSlc6YI+y0scRvx4POxl0YB3V+E2y0cApONHmkzBfjQlnkNqagOzjVnJUadnZnBAW7Q8LmwMwdlcfmAXAOFuGqFZ-nedfAXpeV9ExbVjn+c7HJqTy+nOepV5oZER7tQeOBxatgyqE7S3hXemXHmF0bTq1iRXachdUrS7qEDkOA412XdfLt28qBtI7Mymbh+ZxRnuwLGKZjiw3dMNq6EyyLJnDkBAdiqN7gRcQ20-OUaZoFj5VaWqsaoeBETYyRqdGQORiFIeRPPcmMDGsXQ8gGh57bjBETyLNCY3edaFIrKqtFbRou4ZkBN39baw8yiS1506PQvdjtVNcY-vZSmA1wwWTsjIMpcDXbLd3e6e3TOU+g1PD5t9qb-pO-+Zf7yxXoiVSr4X44lAeiF+RxIF-hfoBF+ItxDAK-r+KU8DGSIPgsAmB3Z4Iv0wbA5eM5l6yEtG4FE2Appk15BTXk0l1D4QDqTSCG1eQMXhvQsaZwJrrSilLThqNMZcLBryNhLCLq8l2iIxEDppESMxPtbmJo8oUIxFJB8IhwEiEAd8GmSo-ogltmok2Ri9ziNfrQehbsZhnWscwwMWRVh+39qQeghccphxMR2B06ZjqxwxA6I4U1k62Timo3Sais6VBzvAMAaBMCkEfvsEungWhiMch-SedDwh-SkXXaqk5Xi4HNFo9+WQIBgGgKYFY9A0gWFkqXKgw8Gb7S0YFCeGNaB-HmmYrpGB3DiC0hbfg39UFwQAOa3H-jop8JpdIkkMiZJKQJdLsStCZTOqzNmMkiRoyMtxHivFZvwAARgANwAMaXPYAAJXAKSOogpHmRHeEFMA9ArZIHwNAJAmgEDsAADKpOKKRB0oKYggGGGMAAzowWgqpWSC0YhoyC4IuJC3VsinIrMOFWIkXihxeLTAc2JbzOoWLGgkppDbeC9R6KMnpaqRlVsCZYMgoQ8QBNKbcuiATOcuNGQHhLE8AAytKJwZYXAlGaOAKFQxYXwr6NMJJEtSKETVYckAFzrnsCmfMGVPRDD5jtNKqVdRx4KhcNfT4Nq2hTNYNahEjqnmyvtb0C1DAEQQuFOKrUWB3h-B9XK6FcKJCJhuN690XqmZAijYGuosatRUsVvwO1xVk6xPYFqL15L01ORoK0LN9yBRGOTknBgNE-mBgBQczVAyqBCqfGcq5Nzfg5EZGLTV6d96TGYGMRgnQID+n8BwTomqqFxkwTRPxMd2AswqNOytnKa1ypan8vIG7z6wCQMOoE3aETdqRDCxtpEdnqvzBAUNjA7mno2VO0I1jK0tCqW65AAKpkToUpq4BwoT2avNhOkJV6FVwpVXewDFNHktt1Z+zth7O3sieP+oVA5u3zBaPKxV7AAAOPAcIgQIz0mIuH8MqHUjhRsw6nh4a7G8faOFzrUbaLRnCJSyMnzecKWjjcOOahI3h8JhFImEWY6R30GHTQkeRtzP8GHXySf1mI0TGT5kmTICkdTqL73hx05qjkiUFJrLIQZky6KzOPNtoRmeeCXhEbafybUlH1IuaxHRjS9UOZ0fY8UjpD42NzzKbZvjTdG6iUY1CM2sN9U4SOWxkadpeSavLoCQTSXdnnrXcBfJ6S-I0YKotPoJl1liYJLyRZBXQQscqxVhZjzSsSA+IaDiFpfRNfE9CDwpYuOCStE6ByLXJL0RtE6DrKR+sqgaw52caCPwAQrCIarEnFu3Cm+BEacsZMK3m3eVLcmrzrayxySt49CaShRn+U43HLunau0dqGHoHHncEX+HGeGzqPeIyaBoHTOOqggVynEfn3tA9lexsTAAPHgST84JUZM4F6DkQCAATCAAsgAeVFYARyzAAVSoAVldAAJdoAbgNAAA+gAekAM6K7AofBAUBlCoVgMpDPAOIZHgBIY0AJvxgAqORJxTwA4EqACNjQA0kY48AGhGgB-eUABSugA300APkpgBD+UAO-K1PaBoACg0RiCAvJI+R4AUUU8cAB0YUq615WtgrhyAKzjDrwA8DqAHylQA4c6AD5TPHJusrqBoGQBQ6gmkmWR4Ack1Hcu5V55GggcXqBycA8HXIvBeAGT4wAX4oAAkyeAqV-Oy423BYuBCO8SzfXSAAH18CF8gIX7A3UO6F7YNUtAhgzA6DVaQIvTkwCF9YNX9gAB7OV1GK-FAgAgGwJIiBkAwHWHAlhrD4FzxIN5NAy0gkLeStg5pwAF0axv6QGACpJIAGLMb64LEAAA1LvkwhgTJvUAA