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.
SCHEMATIC- (click on image to download full-sized version)
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|
|1N4148||CR1 thru CR9|
|10 K||R7, R26|
|TZ581 *||Q8, Q10|
|2N5172||Q6, Q7, Q9, Q11|
|LS3954 ***||Q1, Q2, Q3, Q4|
|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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