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Decide on a potentiometer for UI elements (schematic outdated!)

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Jannik Beyerstedt 2021-02-15 23:04:56 +01:00
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@ -110,17 +110,44 @@ When searching for VU meter circuits, many use the LM3916 LED bar graph driver,
But this chip is obsolete and not produced any more, so we designed our own chain of comperators to drive a set of LEDs. But this chip is obsolete and not produced any more, so we designed our own chain of comperators to drive a set of LEDs.
#### User Interface Hardware #### User Interface Hardware
For the potentiometers, we first wanted to use ones with a conductive plastic resistor element for maximum longevity from Bourns, but these are hard to find with logarithmic scaling. After some long research to find single and dual channel, logarithmic scale potentiometers with the same dimensions, there are only a few options left:
An affordable and easily obtainable (Reichelt) alternative was found in the Alps RK11K and RK14K series. 1. Alps Alpine Series RK09K/D, 10 kOhm (log), 15 mm length, vertical mount: RK09K1130AJ3 (single) and RK09K12C0A19 (dual)
They are available in linear and logarithmic scale, as well as single (mono) and dual (stereo) units and have a nice feeling. 6 mm D-style (4.5 mm) shaft, 6 mm flattened + 2.2 mm (incl. 0.8 mm collar) = 8.2 mm from top
(Update: The Alps RK09 series needs quite less space in the stereo version, so no perfect solution was found, yet.) Notes: Knob might touch surface, assuming 2 mm front plate thickness
2. Alps Alpine Series RK09K/D, 10 kOhm (log), 30 mm length, vertical mount: RK09D117000C (single) and RK09K12C0A8K (dual)
6 mm D-style (4.5 mm) shaft, 12 mm flattened + 11.2 mm (incl. 5.0 mm collar) = 23.2 mm from top
Notes: Quite long shaft, matching knobs difficult to find
3. **Alps Alpine Series RK097**, 10 kOhm (log), 15 mm length, horizontal mount: RK097111080J (single) and RK09712200MC (dual)
6 mm D-style (4.5 mm) shaft, 7 mm flattened + 8 mm (incl. 5 mm threaded collar) = 15 mm from top
Notes: More expensive than RK09K; Thread should fix 2 mm front plate well
4. Alps Alpine Series RK097, 10 kOhm (log), 20 mm length, horizontal mount: RK097111080R (single) and RK09712200HA (dual)
6 mm D-style (4.5 mm) shaft, 12 mm flattened + 8 mm (incl. 7 mm threaded collar) = 20 mm from top
Notes: Quite long shaft, matching knobs difficult to find
Another potentiometer from Omeg was tried, but it had a "jump" in the resistor value at some knob positions. Possible knobs may be:
- Rean F311/ F313 series (11/ 13 mm diameter): 9 mm hole depth (no skirt/ flush with end of flatted axis section)
Notes: Will fit option 1 (and 2, if potentiometer placed accordingly)
- Rean P670 series (12 mm diameter/ 16 mm at bottom): 7.5 mm hole depth + 4.5 mm skirt = 12 mm
Notes: Should fit option 3
- Cliff K87MAR series/ RS Pro 777-73xx: 7.5 mm hole depth + 4.5 mm skirt = 12 mm, inner size of skirt 12 mm (measured)
Notes: Should fit option 3 (boring for potentiometer nut a bit tight); Size quite like Rean R670
- Rean P300 series (11 mm diameter/ 15 mm at bottom): 9 mm hole depth + 3 mm skirt
Notes: Might also fit option 3
TODO: On-Air button The On-Air button needs to be a latching SPST (or SPDT) switch with LED illumination, like:
- E-Switch LP11EE1NCSYG
A possible UI layout in an [Bopla ATPH 1865-0250](https://www.bopla.de/gehaeusetechnik/product/alu-topline/alu-topline-gehaeuse/atph-1865-0250.html) might look like this: ![](docs/ui-layout.jpg) The mute button needs to be a momentary SPST (normally open) or SPDT push button, like:
(The XLR connectors might not fit at the front, but the manufacturer's technical drawing is missing the required dimension.) - NKK Switches UB15NBKW01N-C
- Apem 1413NC6/ 1415NC6
- TE Connectivity PB6B2FM3M2CAL00
- TODO: other, less expensive options highly appreciated!
The casing should be a desk console (angled surface), ideally with space at the front to mount the headset ports (XLR and 6.3 mm jack), like:
- [Bopla ATPH 1865-0250](https://www.bopla.de/gehaeusetechnik/product/alu-topline/alu-topline-gehaeuse/atph-1865-0250.html) (front might not have enough space for the connectors)
- TODO: other options appreciated
A possible UI layout for the Bopla ATPH 1865-0250 might look like this: ![](docs/ui-layout.jpg)
## Notes ## Notes
@ -137,54 +164,59 @@ Approximate prices in Euro.
Connectors and Buttons (User Interface) Connectors and Buttons (User Interface)
| Count | Art. No. | Description | Price | | Count | Manufacturer + Art. No. | Description | Price |
|-------|---------------------|---------------------|-------| |-------|--------------------------|----------------------------------|-------|
| 1 | Neutrik NAC3 MPA-1 | Main Power Input | 3,33 | | 1 | Neutrik NAC3 MPA-1 | Mains Power Input | 3.33 |
| 1 | Neutrik NCJ 6 FAH | Line Input | 1,27 | | 1 | Neutrik NCJ 6 FAH | Line Input | 1.27 |
| 1 | Neutrik NC3 MD-LX | Line Output | 3,22 | | 1 | Neutrik NC3 MD-LX | Line Output | 3.22 |
| 3x1 | Neutrik NC3 FD-LX | Microphone Input | 3,44 | | 3x1 | Neutrik NCJ 6 FAH | Headset Microphone Input | 1.27 |
| 3x1 | Neutrik NJ3 FP-6-C | Headphone Output | 5,40 | | 3x1 | TODO | Headphone Output | TODO |
| 3x1 | TODO | Mute Button | TODO | | 3x1 | NKK UB15NBKW01N-C | Mute Button | 7.50 |
| 3x1 | TODO | On-Air Button | TODO | | 3x1 | E-Switch LP11EE1NCSYG | On-Air Button | 5.00 |
| 3x4 | Alps RK11K1120-A503 | 50K log. Gain/ Vol. | 1,32 | | 3x1 | Alps RK097111080J | 10K log Mono Pot. (Gain) | 2.16 |
| 3x1 | Alps RK14K12B0A0R | 50K log. Vol. (st.) | 1,50 | | 3x1 | Alps RK097111080J | 10K log Mono Pot. (Headset Vol.) | 2.16 |
| 1 | Vishay M64{Y,Z}104 | 100K Trim Pot. | 0,95 | | 3x2 | Alps RK097111080J | 10K log Mono Pot. (Headset Mix) | 2.16 |
| 3x1 | Alps RK09712200MC | 10K log Dual Pot. (Headset Mix) | 2.96 |
| 3x5 | TODO | Potentiometer Knob | TODO |
| 1 | Vishay M64{Y,Z}104 | 100K Trim Pot. | 0.95 |
| | | **SUM** | 84.88 |
Sub-Components Sub-Components
| Count | Art. No. | Description | Price | | Count | Manufacturer + Art. No. | Description | Price |
|-------|---------------------|---------------------|-------| |-------|--------------------------|----------------------------------|-------|
| 1 | Traco Power TXL 035-1515D or TOP 60533 | Power Supply | ~48,00 | | 1 | Traco Power TXL 035-1515D or TOP 60533 | Power Supply | ~48.00 |
PCB Components: TODO when schematic is finished PCB Components: TODO when schematic is finished
| Count | Art. No. | Description | Price | | Count | Manufacturer + Art. No. | Description | Price |
|-------|---------------------|---------------------|-------| |-------|--------------------------|----------------------------------|-------|
| 3 | NE5534 | Low-noise Op-Amp | 0,54 | | 3 | NE5534 | Low-noise Op-Amp | 0.54 |
| 8 | LM833 | Generic Op-Amp | 0,88 | | 8 | LM833 | Generic Op-Amp | 0.88 |
| 3 | LM386N-4 | Audio Power Amp | 0,83 | | 3 | LM386N-4 | Audio Power Amp | 0.83 |
| 1 | DRV143 | Line Driver | 4,50 | | 1 | DRV143 | Line Driver | 4.50 |
| TODO | TODO | El. Capacitor | TODO | | TODO | TODO | El. Capacitor | TODO |
| TODO | TODO | Cer. Capacitor | TODO | | TODO | TODO | Cer. Capacitor | TODO |
| TODO | TODO | Resistor | TODO | | TODO | TODO | Resistor | TODO |
| | | **SUM** | TODO |
VU Meter Components VU Meter Components
| Count | Art. No. | Description | Price | | Count | Art. No. | Description | Price |
|-------|---------------------|---------------------|-------| |-------|---------------------|---------------------|-------|
| 1 | Vishay M64{Y,Z}104 | 50K Trim Pot. | 0,95 | | 1 | Vishay M64{Y,Z}503 | 50K Trim Pot. | 0.95 |
| 1 | LM833 | Generic Op-Amp | 0,88 | | 1 | LM833 | Generic Op-Amp | 0.88 |
| 2 | 1N4148 | Signal Diode | 0,02 | | 2 | 1N4148 | Signal Diode | 0.02 |
| 1 | 1k Metal Film | Resistor | TODO | | 1 | 1k Metal Film | Resistor | TODO |
| 1 | 3.9k Metal Film | Resistor | TODO | | 1 | 3.9k Metal Film | Resistor | TODO |
| 1 | 47 uF | El. Capacitor | TODO | | 1 | 47 uF | El. Capacitor | TODO |
| 1 | 100k Metal Film | Resistor | TODO | | 1 | 100k Metal Film | Resistor | TODO |
| 3 | LM339 | Quad-Ch. Comperator | 0,29 | | 3 | LM339 | Quad-Ch. Comperator | 0.29 |
| 5 | 100 nF | Cer. Capacitor | TODO | | 5 | 100 nF | Cer. Capacitor | TODO |
| 1 | 1 uF | El. Capacitor | TODO | | 1 | 1 uF | El. Capacitor | TODO |
| 5 | Vishay TLHR 5404 | LED red | 0,18 | | 5 | Vishay TLHR 5404 | LED red | 0.18 |
| 4 | Vishay TLHY 5404 | LED yellow | 0,14 | | 4 | Vishay TLHY 5404 | LED yellow | 0.14 |
| 3 | Vishay TLHG 5404 | LED green | 0,17 | | 3 | Vishay TLHG 5404 | LED green | 0.17 |
| 12 | 390R | Resistor | TODO | | 12 | 390R | Resistor | TODO |
| 1 | 39R | Resistor | TODO | | 1 | 39R | Resistor | TODO |
| 2 | 68R | Resistor | TODO | | 2 | 68R | Resistor | TODO |
@ -197,3 +229,4 @@ VU Meter Components
| 1 | 1.5K | Resistor | TODO | | 1 | 1.5K | Resistor | TODO |
| 2 | 2.7K | Resistor | TODO | | 2 | 2.7K | Resistor | TODO |
| 1 | 3.9K | Resistor | TODO | | 1 | 3.9K | Resistor | TODO |
| | | **SUM** | TODO |