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ARP 1047 MULTIMODE FILTER / RESONATOR The ARP 1047 Multimode Filter/Resonator... A really good explanation of this module can be found in the AES paper by Dennis Collin. Some 1047 circuit board photos and the 1047 spec sheet can be found at the HKU Hilversum website SCHEMATIC - (click on image to download full-sized version)
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PARTS LIST - UNDER CONSTRUCTION!
| Resistors | 1/4 watt, 10%, carbon composite |
| Trim Pots | Linear Taper |
| Capacitors | 20%, 35 volt, tantalum |
| Capacitors | 20%, 50 volt, ceramic disc |
| Capacitors | 20%, 50 volt, polycarbonate |
| Diodes | |
| 1N4148 | CR1 thru CR9 |
| Potentiometers | Linear Taper |
| 10 K | R7, R26 |
| Transistors | |
| TZ581 * | Q8, Q10 |
| TZ81 ** | Q5 |
| 2N5172 | Q6, Q7, Q9, Q11 |
| LS3954 *** | Q1, Q2, Q3, Q4 |
| Integrated Circuits | |
| LM301AH | Z1, Z2, Z3 |
* - an ARP part number, most likely a 2N5172. Not all 2N5172's are good as a noise source, so these would have been tested and selected.
** - TZ-81 alternate part was the 2N5249, also defunct. 2N3904 would be a modern equivalent. Also a 2N3906 would be the modern substitute for the TZ-581 (alternate 2N5367) that ARP used as the PNP complement to the TZ-81.
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