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ARP 1016 DUAL NOISE / RANDOM VOLTAGE GENERATOR
The ARP 1016 Dual Noise/Random Voltage Generator was a fairly typical noise circuit utilizing a reverse-biased NPN transistor to
generate avalanche noise. The output was amplified and output as "white" noise. It was also low-pass filtered at 6dB/Octave to get
"pink" noise. Further filtering was done to get the random voltage output. Two of the circuit shown below were built on a single board.
SCHEMATIC
- (click on image to download full-sized version)
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PARTS LIST
| Resistors | 1/4 watt, 10%, carbon composite |
| 100 Ohm | R34, R35 |
| 220 Ohm | R36 |
| 1 K | R32,R33 |
| 1.2 K | R5 |
| 5.6 K | R24 |
| 10 K | R8 |
| 15 K | R21 |
| 27 K | R17 |
| 47 K | R27 |
| 68 K | R9, R10, R13, R14 |
| 82 K | R18 |
| 180 K | R6, R25 |
| 270 K | R19 |
| 330 K | R22 |
| 470 K | R3 |
| 820 K | R20 |
| 1 Meg | R28, R29 |
| 1.5 Meg | R1, R23 |
| 4.7 Meg | R4 |
| Potentiometers | Linear Taper |
| 10 K | R7, R26 |
| Capacitors | 20%, 50 volt, ceramic disc |
| 30 pF | C6, C10, C12, C23 |
| 50 pF | C8, C11, C21 |
| 100 pF | C9 |
| 330 pF | C13 |
| .0033 uF | C15 (3.3 nF) |
| .001 uF | C14 (1 nF) |
| .01 uF | C16 (10 nF) |
| 0.1 uF | C19, C22 (100 nF) |
| Capacitors | 20%, 35 volt, tantalum |
| 1.0 uF | C1, C2, C7, C17 |
| 10 uF | C5, C18, C20 |
| Transistors | |
| A2803-004-A * | Q1 - Noise Select |
| TZ81 ** | Q2, Q3, Q5 |
| 2N5172 | Q4, Q6 |
| 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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