File:Revox B215 recording PCB - VCA bypass.jpg
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Captions
Captions
Revox B215 cassette deck - service and modding
Summary
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| Description |
English: Revox B215 cassette deck - recording PCB - two large film caps bypassing the fader VCA (LM13700 IC, top left). The function is useless, so if it can be easily removed - why not do it? The fader circuitry remains in place, the capacitors simply bypass it. Fortunately, the combined full-throttle gain of the VCA, including its input attenuator, is exactly unity. To preserve it, however, the impedance seen by the output of the preceding CMOS switch must be made equal to that of the (now disconnected) attenuator. The extra resistors, added to match the impedances, are on the other side of the board. |
| Date | |
| Source | Own work |
| Author | Retired electrician |
Licensing
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I, the copyright holder of this work, hereby publish it under the following license:
 
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
| The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 03:15, 14 January 2022 | | 1,733 × 940 (463 KB) | Retired electrician (talk | contribs) | Uploaded own work with UploadWizard |
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