# Doepfer A-103 18dB Low Pass Filter (TB-303) drillable.com › eurorack › makers › doepfer-de › a-103. As of the capture of 9 Sep 2026; the index built 17 Sep 2026, 21:11 UTC · [cites, never asserts](/standing). Source: https://doepfer.de/a100_man/A103_man.pdf · quotes only, no licence recorded. Search `/eurorack/makers/doepfer-de/a-103?q=…` · MCP https://mcp.drillable.com · [html](/eurorack/makers/doepfer-de/a-103?format=html) · [markdown](/eurorack/makers/doepfer-de/a-103?format=md) · [json](/eurorack/makers/doepfer-de/a-103?format=json) · [discovery](/.well-known/drillable.json) · [guide](/llms.txt) ## Records read from it (18) By drillable.com ([llm-extract/3](/standing#methods)); scored precision 1.00, recall 0.36 on the harness's last sample of 50; drillable.com ([llm-extract/1](/standing#methods)); scored precision 1.00, recall 0.41 on the harness's last sample of 44. ### [a 103](/eurorack/makers/doepfer-de/a-103) (4 records) - **type** = voltage controlled lowpass filter · per https://drillable.com · as [a 103 · a 103](/eurorack/makers/doepfer-de/a-103) · [quote](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08?trace&start=61&end=158) · [sha256:8c9ef8c3e57b0573…](/hashes/sha256:8c9ef8c3e57b057320cc8ba8b382e15e98db1249580b2e29029d54ca7e504fb8) - **slope** = -18dB/octave · per https://drillable.com · as [a 103 · a 103](/eurorack/makers/doepfer-de/a-103) · [quote](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08?trace&start=61&end=158) · [sha256:a885333930a0f8ab…](/hashes/sha256:a885333930a0f8abec181e4cba95375b7cfb25c9672d516b1300d35fb2c9f0e8) - **count** = 3 · per https://drillable.com · as [a 103 · a 103](/eurorack/makers/doepfer-de/a-103) · [quote](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08?trace&start=428&end=525) · [sha256:b79829cbecd1a4a0…](/hashes/sha256:b79829cbecd1a4a0ee2409a346414d01a03d1a2a0a01deeb72c3e058632b574e) - **cv-input-count** = 3 · per https://drillable.com · as [a 103 · a 103](/eurorack/makers/doepfer-de/a-103) · [quote](/hashes/sha256:3643d775d97de6a75343d70c0fd9f3d09151dfaf1e17aea53391dba5f2b9baad?trace&start=429&end=526) · [sha256:08c73f027cc398fd…](/hashes/sha256:08c73f027cc398fd46edbe2ac7a1e8bd1ffe3817192260552f54f35de6a52b04) ### [control frq](/eurorack/makers/doepfer-de/a-103/control-frq) (3 records) - **function** = Cut-off frequency control · per https://drillable.com · as [a 103 · control frq](/eurorack/makers/doepfer-de/a-103/control-frq) · [quote](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08?trace&start=1190&end=1224) · [sha256:d60e5144b3aeab9a…](/hashes/sha256:d60e5144b3aeab9a90e66805db87feca1bd239bf580cb43115132062b0062895) · same value when read [9 Sep 2026, 15:42 UTC](/hashes/sha256:d23d7c1a349576911e2c8a9c85aaf2795355fe4416c8e02783c5238341879dce) - **behavior** = at 10, the filter is fully open; at 0 the filter is completely shut, and there will be no output signal at all · per https://drillable.com · as [frq control](/eurorack/makers/doepfer-de/a-103/frq-control) · [quote](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08?trace&start=1911&end=2165) · [sha256:b8192c7083911bad…](/hashes/sha256:b8192c7083911badfe8089790ebe2139c3219f301a568522e45f8a6db078a053) ### [audio out](/eurorack/makers/doepfer-de/a-103/audio-out) (2 records) - **description** = Audio output from the filter · per https://drillable.com · as [a 103 · audio out](/eurorack/makers/doepfer-de/a-103/audio-out) · [quote](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08?trace&start=1558&end=1599) · [sha256:8df27fd3d76d87e1…](/hashes/sha256:8df27fd3d76d87e1276f1fe26b1164d0f2e70fbe9fe7572fcbfae10362cd2883) - **description** = sends out the filtered signal · per https://drillable.com · as [a 103 · audio out](/eurorack/makers/doepfer-de/a-103/audio-out) · [quote](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08?trace&start=4248&end=4294) · [sha256:3dfa7f0193a1c738…](/hashes/sha256:3dfa7f0193a1c738c6df0b1bfe798989d62e03179e362d6031229462a59fc044) ### [control res](/eurorack/makers/doepfer-de/a-103/control-res) (2 records) - **function** = Control for setting the filter's resonance (emphasis) · per https://drillable.com · as [a 103 · control res](/eurorack/makers/doepfer-de/a-103/control-res) · [quote](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08?trace&start=1337&end=1400) · [sha256:caf06803c8b59bbd…](/hashes/sha256:caf06803c8b59bbd3f8acaddfa275f244905677e4dca3b95088ef0773cb2f9a7) - **behavior** = close to its maximum setting, the filter becomes so resonant that it goes into self-oscillation, and starts behaving like a sine wave · per https://drillable.com · as [res control](/eurorack/makers/doepfer-de/a-103/res-control) · [quote](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08?trace&start=2756&end=2890) · [sha256:22e19b7fc83bff69…](/hashes/sha256:22e19b7fc83bff6964f553efc415f73e9065666b13fa0ca1d2cfc70d5f67f571) ### [audio in](/eurorack/makers/doepfer-de/a-103/audio-in) (1 record) - **description** = Audio input to the filter · per https://drillable.com · as [a 103 · audio in](/eurorack/makers/doepfer-de/a-103/audio-in) · [quote](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08?trace&start=1520&end=1557) · [sha256:1609a1ecfe9c86d1…](/hashes/sha256:1609a1ecfe9c86d1279883fab216c15b22c564e0727c476d754fe0359c52bf2b) ### [control cv2](/eurorack/makers/doepfer-de/a-103/control-cv2) (1 record) - **function** = Attenuator for CV at input " · per https://drillable.com · as [a 103 · control cv2](/eurorack/makers/doepfer-de/a-103/control-cv2) · [quote](/hashes/sha256:3643d775d97de6a75343d70c0fd9f3d09151dfaf1e17aea53391dba5f2b9baad?trace&start=1226&end=1262) · [sha256:635be81fb0fb5acf…](/hashes/sha256:635be81fb0fb5acf96879c4135f568adf7559dfc27cb694004a454f086e13f98) ### [control cv3](/eurorack/makers/doepfer-de/a-103/control-cv3) (1 record) - **function** = Attenuator for CV at input § · per https://drillable.com · as [a 103 · control cv3](/eurorack/makers/doepfer-de/a-103/control-cv3) · [quote](/hashes/sha256:3643d775d97de6a75343d70c0fd9f3d09151dfaf1e17aea53391dba5f2b9baad?trace&start=1263&end=1300) · [sha256:e576607f3f731c2e…](/hashes/sha256:e576607f3f731c2ef6e5a72aec2860ee565d80db227cec2a1c5b7cd640776695) ### [control lev](/eurorack/makers/doepfer-de/a-103/control-lev) (1 record) - **function** = Attenuator for audio input $ · per https://drillable.com · as [a 103 · control lev](/eurorack/makers/doepfer-de/a-103/control-lev) · [quote](/hashes/sha256:3643d775d97de6a75343d70c0fd9f3d09151dfaf1e17aea53391dba5f2b9baad?trace&start=1301&end=1337) · [sha256:e2779a17f79d241e…](/hashes/sha256:e2779a17f79d241ee2d5ed2351e26f94d13287fa4a781f2013f811b7208aca05) ### [cv1](/eurorack/makers/doepfer-de/a-103/cv1) (1 record) - **function** = Control Voltage input · per https://drillable.com · as [a 103 · cv1](/eurorack/makers/doepfer-de/a-103/cv1) · [quote](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08?trace&start=1415&end=1444) · [sha256:4d52dbaab3c7c96c…](/hashes/sha256:4d52dbaab3c7c96c1f174563af6fbbb11274022de492618f3f1c1b4ff7891076) ### [cv2](/eurorack/makers/doepfer-de/a-103/cv2) (1 record) - **function** = ditto, level controlled by 2 · per https://drillable.com · as [a 103 · cv2](/eurorack/makers/doepfer-de/a-103/cv2) · [quote](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08?trace&start=1445&end=1481) · [sha256:c40b5ced6cfed295…](/hashes/sha256:c40b5ced6cfed2953a756360692f09b11923243ae24cb2fe324985280fc010d7) ### [cv3](/eurorack/makers/doepfer-de/a-103/cv3) (1 record) - **function** = ditto, level controlled by 3 · per https://drillable.com · as [a 103 · cv3](/eurorack/makers/doepfer-de/a-103/cv3) · [quote](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08?trace&start=1482&end=1519) · [sha256:96207fe71329e59d…](/hashes/sha256:96207fe71329e59d4e8b298e3da3a5db8c85f8307e6d3aa7da8d067dbddfe628) ## Captures (1) - 9 Sep 2026, 00:04 UTC · https://doepfer.de/a100_man/A103_man.pdf · quotes only (no licence recorded) · 0 revisits · [text](/hashes/sha256:1c7ee54f14d3943123cd7be716e8396f12dcbe230634a01f5f8a997f22eefa08) (pdfium/7881, 6231 bytes), [older text](/hashes/sha256:3643d775d97de6a75343d70c0fd9f3d09151dfaf1e17aea53391dba5f2b9baad) (pdfium/7881, 6240 bytes) · capture [sha256:b889299ce399ec44…](/hashes/sha256:b889299ce399ec4408cda23a32e177642da9e053f7af636aad3eaac11d344949) A capture is what the source served at that moment; a later change at the source is a new capture, never an edit to this one. --- [standing](/standing) · Drillable™ is a trademark of Drillable LLC.