delay.md

Notes for new design

• in: delay CV
• pot: delay time / CV trim
• in: feedback audio (defaults to wet out)
• pot: feedback level (for feedback input)
• in: audio in (defaults to other delay's wet output)
• out: wet output (serves as feedback source) -----optional-----
• out: mix
• pot: wet level (into mix)

opamps delay in: 3 feedback in: 1 audio in: 2 (incl. filter) wet out: 1 mix out: 1 --> 2x TL074

--> See how many PT2399 we can fit in 1/2 a board. Assume SMD is OK. Try for 3x. Perhaps double board?

Simple current control:

https://www.falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWcMBMcUHYMGZIA4UA2ATmIxAUgoqoQFMBaMMAKACURCUAWCsFChkJ8BVCNzHQUSMFKRUYCFgCdOPESCF4NYlhOKbC2hCm15CvE9uxRowhbBTYw8V28gCU7EHjDDuxMK+-hZQYRLUCrZKAC4+oVYgxPwUpmEQTHYkGJRgCObY3ITYhPbQCAhgOSjEBL4YfibIVAAmdABmAIYArgA2Md7JApUCQyBFvFERKOVhDkqqY4T4SSlG2mKUkCwA5qsC6-uaaHMsAO5Hy9pjCNyT54bGd4+cK9sXWq-Xa2-ewRTLHx+CjEUThKIQ8osAD2YVCVH0BnksHgZEICC48hAAl4hBhPk4k3AKFMBhg8Ag5MgfgsPAwkGSoKEGG0EAE1hYQA

5V CV with bias somewhat fixed:

https://www.falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWcMBMcUHYMGZIA4UA2ATmIxAUgoqoQFMBaMMAKACURCUAWC73hBkJ9eVCN1pQpMBCwBOnHiJBC8y2vBYTiKwmoQo1eQgMMhsUaMKoxIKbGHhPndkCnYg8YYd2LCvPibSIBLgKMEyLAAunkEGasRg4fFSEAyokGDGEhh4kBjcAdwWMsTaemi+dt7IVAAmdABmAIYArgA2UR6J4dh6ID3maMGhKNBINpayCoOE+ANJnHhqYpSQLADmC+F6CYsYwzYsAO7bnPODCPxQJ7r616qKoh4puaZGNZOhTOGTkTFlXi+YSDYGpKbEHgYLJYMgkQzkGCERx+DCkYoSSAIMDkRz1JptTosADGA0hIT8ZOS1xssHgEDGeGweAk2H4aDx2ERdNYW1I1N4-IoQmktyFYMBFOs8ipUuQBzlYk0HEcCuZvFVvQMI0kf3GLDqyCU6vlvRZbhADRaHS6p01IUKpsVYvJJvFlPWp1BNVBeRup2yT1i7xuW0e2PCjzBRwUjy4vED8dSmj6RjiZkD0ZuqYG1wleaCMadJvt-BWNHWClLlPtgmstXWW1rItr5KOXtd5scxvN6wAHgMEDpcEhmObcGpeEo6gBLADOxIAFs05Bs6AAdOfNKKbudRFdRVoABxYOfDDz6FEWRxxvGw2oOVHv4TyYgrcEsEggbDoc-n+4AO2JOgZWfTwajAvAPRUNZK3MB9hjAkxJgwWCPCQ0IkPmL4xF+aR9Q4SDKTAyFyyob5r3w2RTkKKhHjPfp1hzWi7hCbBI0gUQbkNQYc29YRwjAAA5QRmBlOMlEIBBhCTJU4A8KSZMk6SKDbKQKPGCJ9W0EI-VQ5JyX08BLGEJgwGgPxsCsrgvG4AxEEsOwHH9XS6MvFjdhcjzllUnYfM9Xyln0QztXWDhXmGFJPJwsItNkDgAgoOZwOEIc8PIqgfji8T+iMwgFSMuSAvyyNtTSmDfhYAB7VJ6ySFBiF1OlMikcsLCUKhjTcCZuvMcwICfCBsGqtwxHrbRyAmZrciSHrwkQlggA

CV and potentiometer, ready for first test

https://www.falstad.com/circuit/circuitjs.html?ctz=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

Added clamping circuit

https://www.falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWcMBMcUHYMGZIA4UA2ATmIxAUgoqoQFMBaMMAKACURCUAWC73hBkJ9eVCN1pQpMBCwBOnHiJBC8ysfEgsJxFYTUIUavIQFGQ2KNGFUYkFNjCbnmlCBTsQeMMO7Fh3r6m0iAS4G62VrIALuDY-Mpg2MRuCAliIAwo0AhcWCaQGCjMxPZRpYJoBGCU2ILkTlQAJnQAZgCGAK4ANtGeSSkWeLwDbtjYNlJh2UiRMvJxg1wjyW4YkKKhcCwA5otrG-sqE9IsAO5Hy0e5tud6BgmqiqKehmoYwxTmgSFhTBHSHIsWJgbhKBBgNyjCiQqQQGSlSAkEwIfxoPyiayFUi4DDEQQkHBIRogFodHp9ADG4G4RRhUNpqUIkTAjDU3FgxH4yX4hD5+n8VjgrD2oLpNxp4sGtwuYtSsNB4NhWgUcvp4AQhnVGm2HBqWokYk1Y30v0kcyBTQ1h0NGoNcHcpLaXV6d31bm4wXd2rdjK2Yj9EIibtWoWwUNDfhsdxMvCusa+ai0eyeQfuoUFtwUT3jwSuOq0E2MwTeXmCUdORZpSoZSm4eDmC29tubwR1uztqUG3uZSagvrpLcovFtWgAHjTkhZiuA+bxwyP3LwmgBLADOlIAFu05Ds6AAdNftaKHtfRHfRToABxYVdTjxOaduYAw861RSodTcDYylHgQsgJA2DoNd13PAA7Sk6AWL8vB8CwtTwTMLGcGD3zQBC3FMSJuD-LQOFg7DMM4fAzRCWwgQIxDBVglI+yoP5lUBWQLnrKgnjvU1C1NNj024cMVEOW4rWhbBPmhfi3ChAA5QRmG0SBdF4jAtVRNYtXhaxMmIaA8X47xcEoEgfBsWAHHhO5lJOXj9CTSyG04PADCWJz+wuNTHOc9Tgw4UsP0TTyyKYijZA4H4JXC6Upiof5yKBbNTRUrC6SSuF4DuQgUtUwZUq0C4cyUJ5coU3QnHBBJmFUiqrGELJsGgfEUDSQpwyIPAhFM+xHH7PV7AEZlkHBKKGKoGY4tkVU+oC-xaHMAstBEtBaAqmpUgSNwyRdPpetcq4nDpQhcjI2KLVC5BXLTfaPWQkbwnGu4Zumgb+Dsi5Hpe8JBQ+vLPt8etfvUN0UEFNIVgSUH+yrJJwYq+IBGC29TUqtaRlW7VIaRqbSzKkcbtvdZzoMIRCeecBTgUBNS0e0sCyBh0IchEH0hYAB7OFJkhYHzVgYUpD7SwlFG+d3FmEWLBQqRcAsVn3DEDmUCMXQ7F55XHH4wofFfZJDEKKQpM-FggA

Optimized with only 2 opamps

https://www.falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWcMBMcUHYMGZIA4UA2ATmIxAUgoqoQFMBaMMAKACUQ8xCKU8QMhfgj5RwIACy0xVGAhYAnTt179ihWqKph4kFgBdw2CRIomjxFGdPaQDGNj55CKMBMITsbvBn4wXYOoIGBIIUpDBvshUACZ0AGYAhgCuADb67BZW2HimYNiWINjYPLKSVCjQSGVyilkgLnkFVhiQNuV6AOb1rU2FOKVQLADu9Y31CBpDHCL8vqazyoNUUnZgVjVVBuASKAvrEwe2-vnECMbFPtgYYD5Q0ITYCMQFEsRSxHgEztEgcUlpDIAYx2GCsCAObjBFCm2kY-EqrQwpA8oUmfFc9zgrG6UPBUzxFEKshGoPBkN2+w2dUJEKsYAQIgoR2ieg4DKZ4XAjOyQhk5Wom3kMW5bQ63M5cBAVn+KXSpI5VnceR5zOpo0JXNpRwVzUkjnqb1KLBK-DcezVOwtEjwNRpqq1Do8Yh0XQl4MKioa+BkCok0MdYq5egAHjsCkVMdxnY5TKYLTEAJYAZyBAAtEgpOnQADrJxL6PPJ-SZ-TJAAOLDAISKTLBVCeVlttko8HulFIIDYdGTKZLADsgXQ6o2lrWm+oxKFdCO62hxw1Vg3dGyFx4G0yNH4p9oNjIthxR3hJ6PLNuVlQmHvZFtRjaqIJ+KaBHy9M-7y-+J4WmKSSLTtkuSGga9IAHLBMwLAfJItoCEyzwtEyED+Gs2DQEiKAQpA+TMGcEJYigXhDHesEDDBVBCH4pIfpRRJWLReijAhDRfHRcHUjMoj1qoLHngKLI3vISiPuxDTQhgTLaPApKEOJ8H9JJUGQMQyAWmEeQMuC5jIQ8diEdAZyYVIYKoiYmEEURq46GpBKQGpxI7tKVT8rUSjWQsojqJo26unALD-mgtDaZp1jSn8CRyhk7L4Pw4w6NChCTPyqxXi5B7IKxdLIAGk5lKsAntqSXk8cVJhUaMpU2uAKCTmVxHVbVVXrJO6n1c1PCtfk5itW+fJdQs2nGFSvrPsw8HBfBAkmn1dkeWas2SLlQzXFJmWCBlsUWshbWBaF7WhYxn6icVEnqiAJ1MsVix6AA9i6gzrDV0gwPA23tNg4A+U+LB3dW4APSgfAqS92JYrNjKTIyBDWcQdmDPS5DYCwQA

This does work, but required the resistor between the potentiometer and opamp from 1k down to 100 ohm.

New circuit

from https://github.com/m0xpd/encore?tab=readme-ov-file

https://www.falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWcMBMcUHYMGZIA4UA2ATmIxAUgoqoQFMBaMMAKDXI0LwrBRE+4AWPFUEgAJnQA2AfQDGANzaQOXCsT4CKhUROkypCqSwBO-NQl4g8hMZb5Uw8OKfPcEG67fUPkzlgDuXnZWNnaekK5hPsEghBi+KGjwLABKsfF80RiQYlSiVEy++dAILIKQxCDEOnH4yAiEddwQME1MCNDEzFz4CDgYGmDkMJAo2K2B1bUeWd6zUCwA5tNUhChiNWsVUIvpTvW2jnDcmbsFIEXnUKVpfu6c9xSCebs7Vvk3ZWbR9g1Nf2O-iCTkaPD4oKaOm4kTMkOa4DA2Ch9SBKX2YDw4QhmLstU+72KXzuzCxcTBpLEXBhb0KH3OtwqVWYyLiG3A4z46zErWg7WY0DQeAIKgQHnWCFZo3GkxWLKh7yRULB+Sm8oR6oQKBhrk12sRrJeNIO-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

0V 0

1.56V 0.312 185K

       0.168      100K

2.4V 0.52 309K

5V

Optimized with only 2 opamps, replaced startup with MOSFET

https://www.falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWcBmBsBsyCcyBMAWLSXXSAdhAS0sskoFMBaMMAKACUQAOMdS3LiDLpBCAVHAhSdJHTnQErAE7de-QVnQzxdMPEisALinz5KplFlzmzukIxj5cVLmTDOuuXrmRRo6XmFITxIEBBE1PToAE3oAMwBDAFcAG0MOS2tkLjMwbCzkPjkQfDpcBQl5RRU8qxB0cMyhQolSgwBzJrIW2uthQTlWAHcm9AIm8MHOMUEyHPVVIta6ZmtimEUR3pK8JsIi1gAPcHwECAQuQUC+KggzceiASwBnAGMACwSldvoAHWeEoZ-s9DF9DEkAA6sMBkMyoPqkEDw7hwSRReB+RAgdj0Z4vUEAO1e9AyBDoZEg91KlDqxWpYH8lT8ik4ZMWUmpVgGy2ZTI2wxKXHJIiRIv6UFYhUE+CFQhF+F2FNsEuiTWyuXyO2s1jAADkEG42KVqDLyWIaX1zRAYHxmMhYOQsJoDQrCMFMT5rQLTc0+D6RANvbKAxb6pcJSMqNYQ1GhOaDNNxGRETMw9y6PS1pUFMo5bNzehk3Gs+iBYXLdZY2R46xjeBiGYEBYWOam7k-Lb3AouOgsLDTmFyGMirBPRLOHpxpN61PaTyGUsqrnJ43xJptNz0QZVe5UW3wGBWxZrLFEql0hPgoIxrlyNHGnSVu4+TnL+Gzjq7yVNEzMy-NiA64LEBpiBiMIEyuAuA-qBEZQTBkHuD++4GFs0E3M2yAWChkoink2GYdhz6DFKB5Hrkh6VsREqkSuCx0fslSShS9bvsIrHXuM1pwbuMjNuhNhweK1bWEBIlwWJ5pAamqETOI2yMQm4ABHw6D0ip9Tuo+NDrDmcQnOMam6JqRlIjqFQwMQApgPgRamTZhnUgYrwnHZ9K2QiGaYvodzQDZpxqWAXBWPgQUNN5XqdDZRbJroHnFkxNQIC09kaaZuj6MuyWqfS2VCIiGWZVseWxa5nk8fF9l5elubIqVyI3hIyD6AYKjIjwfDtT+GYIPArCdF1nVSTo45IgW4zIrG2myNmigAPYSGougkEQgHQHgyBIZSToCGIFCWXA3HKr4yC+HQp1IqwC1XEs7gCNQB2QNaDo+GE1bDjwpRgH2SzWIIyCsEAA

Grouped input behind inverting amp, so higher CV means higher delay

https://www.falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWcBmBsBsyCcyBMAWLSXXSAdhAS0sskoFMBaMMAKACUR84uAOO1Lj506EUnSQio0BKwBOIXmHSVcvEFnQS1UcPEisALinz5KplFiEILokI1yx+qU8vwJ0CKhRjJeCSHQyPF4sLFdeITAeABN6ADMAQwBXABtDDkshPzMwbGzkFSluEEdJXRhZBTyrEE8VGqFgoq44VgBzLJBmrrJ0dRFWAHcu9AIuj0HOfvUtWd5ZkuK6ZiEpSuGu-DwtzShWMDIzQW7SEBP+O2j9aUQQdnoAZwBLR8NEgDsAY3pMk6t1P8tBVWvYwGsKjJNjluv1znC+gNWIV1Ph+JRgVQmpAzIMYl0YY0uDsogA5BBkFisbjUdAlCkqMgIax9cDSFSMLDQI64MAIaL85CUsi4IqwXDICAGaYLcxmGaUcEgkpK9ZQml6cY2XJ86wWKXQDkS6BYZk2cjccgIXhM24SqXyTVmZnqTTaAZ6eCsfHgnja8C6uWlEBxJJpDKcaKysa5chCerKlaqyGySOQWX8qJxrh7ZbgCEiKEjN2qV3A0xI4vltH5vYV-YjcF1mtNlT+gyN3B7f15Czt5Fw3vO-XIPvJgwogPMoMsaeZioD9TRLU6ZdmQgtCdkUTp9QMvTR8ZShv5v36rtt2ybIku3ZFTLKZR1FXoJ9zRM0NWyeLgfDjOmiPkz4CFEMh2te+AisBv7-ksrBfL+UEAYhTRnLisD6BA+AyO4uE2PhXbgpIGEOp0YCQahogUd006DNUCCFNBj4qMhO5evRjHIXyjEilI1xeo2DGMmc5FQbxJ6ifGKpCdB0rnNOMbydYtR5uUhZVNBaJ0EyQhabo-FtCMOnCDRLL3iMShtjoxn7h2mnoshkz7J0jm1Mhil0dBTl6U5bHsa0dB6UF6J+W0CgwoiJmRaFdnBYF6K+ZsPnlui0XQgp4wnOJBgKCW9YlpOdDiG0nAFXCBWMapIIbLlmI6CWWL6foHQaJitQlh5+zhdOllKRoOh0Fo-m9eJvWsZ6YWKE+o3TbwuJcNucljSUY3ph+anSLInQjXNU0qL1gwWdNInEGY2XXqdpw7lqwIGAAHhoNjdCweh8s966lGYAA6AAOYCGgAaqwAD2+ktOCXYSLccDHvNyClOUuBIMgIOKOA4MkKE0OQAacAEKQYy8H4XiCJS81CICrBAA

Controls

jack in jack wet jack return (default to wet) pot feedback (jack return to GND) pot time jack time

jack mix pot mix