Hearing Aid Volume Control PJ 77 Features
- Controls can be purchased with or without knobs
- Choice of terminal lengths and styles
- Choice of axle styles
- Choice of resistance values and tapers
- Knobs are changeable
- Select from a variety of printed numbering styles
Hearing Aid Volume Control PJ 77 Specifications
Mechanical Data
| Operating Torque | <0.1 Ncm (0.05-0.09 Typ.) |
| End Stop Force. | >2 Ncm |
| Mechanical Rotation | 260° + 10º |
| Pull Off Force for Number Wheel. | >5 N |
| Electrical Rotation | 230º ± 20º |
Environmental Data
| Rotational Life | >25,000 cycles |
| Soldering Temperature. | 260°C/500°F for 3 sec. or 315°C/600°F for 1 sec. |
| Cleaning | Aqua wash (Alpha 2110), Ligroin, Ammonia, 10% solution with demineralized water |
Electrical Data
| Power Rating. | <1 mW (max.) |
| Resistance Tapers | See the “Electrical Taper” chart |
| Standard Resistance Tolerance | ±20% |
| Noise Resistance | Rr <20 dB |
| Insulation Resistance | >1 MΩ |
Construction
| Knob, Housing | Thermoplastic |
| Base | Reinforced glass epoxy |
| Terminals. | Gold-plated copper alloy |
| Resistive Element. | Polymer |
| Wiper | Gold-plated copper alloy |
Model 7500 Wheel Volume Control Body style
Dimensions are shown in millimeters (inches in parentheses).
Potentiometers are shown in the center position.
Terminal Length
CENTER TERMINAL (LW)
[A] Threaded M1 x 1.2 mm
[B] Threaded M1 x 1.5 mm
[C] Unthreaded Ø 0.3 x 1.2 mm
[D] Unthreaded Ø 0.3 x 1.5 mm
[X] Special
END TERMINAL (LA)
[A] Ø 0.3 x 1.2mm
[B] Ø 0.3 x 1.5mm
Resistance
The value is expressed by 4 characters, 3 of which represent significant digits. 4th K or M is a dual-purpose letter designating both value range (K for K ohms) and decimal point location.
Examples: 560K = 560 KΩ
25K0 = 25KΩ
Note: If less than 1 K ohms is required, specify exact number.
Electrical taper
To determine taper, see diagrams in “body style”.
Positive tapers are measured from a to b.
Negative tapers are measured from c to b.
Number stamping
The knob style diagram shows the placement of the number on the knob.
| Placement on knob a | 0 | III | 1 | 4 |
| b | I | II | 2 | 3 |
| c | II | I | 3 | 2 |
| d | III | 0 | 4 | 1 |
| Without Numbering | [00] | |||
| With Black Numbering | [01] | [02] | [05] | [06] |
| With White Numbering | [21] | [22] | [25] | [26] |
| Special Color Numbering | [41] | [42] | [45] | [46] |
Color Dot 1&2
Color marking identification of resistance values on the reverse side of parts.
[01] BLACK
[02] BLUE
[03] BROWN
[04] GREEN
[05] ORANGE
[06] PINK
[07] RED
[08] VIOLET
[09] WHITE
[10] YELLOW
Other Hearing Aid Volume Adjustment Accessories
| Product Photo | Model No. | Description |
|---|---|---|
 | 7000 | Volume Control PJ 185 4mm VC, Leaded Style Volume Control with Switch |
 | 0105 | 2.54mm Trimmer, Miniature Trimmer |
 | 1900 | Trimmer PJ 63 200Kom 1.9mm Trimmer, Ultra Miniature Trimmer |
 | 2500 | Button D 2800/PB 95 2.5mm Button Switch |
 | 2400 | Push Button Switch PB-100-H01-T01-210 1.9mm Button Switch |
 | 10.18, 70.05, 70.032, 50.05, etc. | Litz Wire Compliant RoHS, Structure can be customized |
How to Order Hearing Aid Volume Accessories
Please read the parameter information above, fill in your choice in the form below, and submit, our professional partners will contact you as soon as possible.
