Diagrams
Zip Files
Tips
When I designed this unit I wrote a little program in QuickBasic to calculate the gyrator component values. I have now found a copy on an old backup disk and have included it on this website. A link to the download file (includes source code and .exe file) is in the list below.
Steven Dumon suggests the use of a TL074 dual op-amp in place of the LF347 (which is apparently now difficult to obtain).
Parts
| Resistors (0.25W 5% or better) | |
| R1,2 | 47K |
| R3,4,5,6 | 10K |
| R7,9,11,13,15 | 1K2 |
| R8,10,12,14,16 | 18K |
| R17,18 | 100R |
| VR1,2,3,4,5 | 50K Pot |
| Capacitors | |
| C1 | 470n |
| C2,3 | 330n |
| C4,5 | 100n |
| C6,7 | 33n |
| C8,9 | 10n |
| C10,11 | 3n3 |
| C12,13 | 220u 16V |
| C14,15 | 100u 16V |
| Semiconductors | |
| IC1,2 | LF347 |
| D1,2,3,4 | 1N4001 |
Miscellaneous
9-0-9V 100mA Transformer, PCB, Case, Knobs, SPDT Switch, Two Phono Sockets, Screened Cable, Wire, Mains Flex.
This project, including all text, images and diagrams, is copyright 1991 - 2003 Paul Stenning. No part of this article may be reproduced in any form without prior written permission from Paul Stenning and WallyWare, inc. All details are believed to be accurate, but no liability can be accepted for any errors.
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