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Hardware docs: 1413 is the Quad Amplifier Board — a bolt-on Pyramid PB-150P

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Photos of the physical board (Rev. 1) show the amplification is a stock
Pyramid PB-150P Pro Plus 4-channel car amp mounted as a module; the VWE
board is passive: 12V/remote power distribution, per-corner 3-way
crossovers (Dale IHB-3 820uH/180uH, MMP film caps, CP-5 2R pads), 6-pin
woofer/mid/tweeter corner connectors, and the LED output-check circuit.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Cyd
2026-07-19 14:02:25 -05:00
co-authored by Claude Fable 5
parent 40ad8e3b27
commit 552d74f337
1 changed files with 17 additions and 5 deletions
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README.md
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@@ -19,7 +19,7 @@ board), so these drawings post-date the Rev. 0/1 boards they describe.
| **1401** | Buttons board | Rev. 0 | 2× UCN5821A lamp drivers, 2× 74HCT165, 74HCT164, 74LS00/05 |
| **1402** | Keypad board | Rev. 1 | 2× 74HCT164, CD74HCT165, 74LS00/05 |
| **1408** | Display board ("RIO external display") | Rev. 1 | Intersil **ICM7228B** 8-digit driver, 8× LTS313A 7-segment |
| **1413** | Amplifier board | *(schematic only, not photographed)* | 4-channel speaker filter/check board, 12 VDC 5 A |
| **1413** | Quad Amplifier Board | Rev. 1 | **Pyramid PB-150P "Pro Plus"** car amp (bolt-on) + passive 3-way crossovers |
Plus the cockpit position sensors: **HP HEDS-5700** two-channel quadrature
optical encoders (option code **I** = 512 counts/rev; the photographed unit is
@@ -98,10 +98,22 @@ hardware addressing is what the 0x00–0x6F logical input map in
printer port"** header with series resistors and per-line LEDs — a
diagnostic tap so a PC parallel port can exercise/observe the display bus.
Silkscreen reads "P/N 140B" but the schematic title block confirms **1408**.
- **1413 Amplifier board** (`AMP_PLT`) — four channels (front/back ×
left/right): LC crossover filtering (820 µH/180 µH), 4 Ω 5 W loads, 6-pin
woofer/midrange/tweeter speaker connectors, a 12 VDC 5 A supply input, and
a green/red "speaker outputs checking circuit" per channel.
- **1413 Quad Amplifier Board** (`AMP_PLT`, silkscreen "Quad Amplifier
Board … P/N 1413 REV. 1") — the actual amplification is a stock
**Pyramid PB-150P "Pro Plus"** 4-channel 12 V car-audio amplifier bolted
to the board as a module; the schematic only drew the VWE-designed
passive circuitry around it. The board feeds the Pyramid's `B+12V / GND
/ REMOTE` screw terminals and speaker-level `HIGH INPUT` connectors, and
its four outputs (`1CH/L`…`4CH/R`) return through terminal strips into
per-corner 3-way passive crossovers: Dale IHB-3 inductors (820 µH woofer
low-pass, 180 µH midrange, date-coded 9531), MMP 100 VDC film capacitors
(2.2 µF/10 µF), and Dale CP-5 2 Ω 5 W pad resistors. Corner speaker
connectors J1–J4 (front/back × left/right) are 6-pin: `1 woofer+,
2 midrange+, 3 tweeter+, 4 woofer−, 5 midrange−, 6 tweeter−` (silkscreen,
matching sheet 5). Power enters on J5 (4-pin: `+12VDC ×2, GND ×2`) with a
green POWER ON LED; the per-channel red LED pairs across the outputs are
the schematic's "speaker outputs checking circuit". PCB etch NT 1-0A 3695
— the same fab batch series (week 36 '95) as the buttons board.
## GAL dump — [`gal/GAL20v8a_5764.JED`](gal/GAL20v8a_5764.JED)