The life of a speaker depends on the quality of the voice coil. The voice coil is the heart of the speaker. Now I will introduce the knowledge of the voice coil to the reader.
The voice coil is divided into ∮13.28, ∮14.28, ∮16.4, ∮19.43, ∮20.4, ∮25.5, ∮25.9, ∮30.5, ∮38.5, ∮35.5, ∮44.3, ∮49.5, ∮50.5, ∮5 , ∮60, ∮64.5, ∮75.5, ∮76.5, ∮78.6, ∮99.2, ∮100.2 and so on. According to the frequency response, it can be divided into low frequency, middle frequency and high frequency speaker voice coil. According to the material of the voice coil, there are PL, PSV, AL, ASV, KSV, etc. The first letter is the code of the voice coil skeleton material, P represents the paper tube, A represents the aluminum sheet, L is the temperature resistant 135 ℃ wire, SV represents Temperature-resistant 180 ℃ wire (temperature-resistant means that the glue attached to the surface of the wire will not fail at this temperature), K is a special material (glass fiber), the English name is KAPTON, and the temperature resistance is above 220 ℃. According to the number of layers wound by the voice coil, it can be divided into single layer, two layers, four layers and six layers. For the quality of the voice coil, first of all, from the outside, look at whether the wound wire is flat and clean, whether there are jumpers, looseness, overlap, whether the surface insulation of the wire is peeled off and scratched, and whether the sticker facing the wire is swollen or warped. Whether the inner diameter wall of the voice coil is smooth, whether there are burrs, and whether the resistance value is standard or not.
In addition to the frequency response and power of the loudspeaker, in addition to the strength of the magnetic field of the magnetic steel and the diaphragm, the impedance of the voice coil, the width of the wire, the size of the wire, the voltage and temperature resistance, and the maximum allowable current. For example: ASV∮25.5 & TImes; 30H & TImes; 3.6Ω & TImes; 0.26 / 4F means that this voice coil skeleton uses aluminum sheet (A), wire (SV) with temperature resistance above 180 ℃, voice coil inner diameter ∮ 25.5mm, voice coil height 30mm, impedance 3.6Ω, use ∮0.26 wire, around four layers. To make a voice coil, you must first know these.
Instruction Manual
1. Features
Clock display, 10 sets of adjustable timed power control, randomized power control, manual switch and optional DST setup.
2. First time charging
This Timer contains a rechargeable battery. It is normal that the new/old model runs out of battery if it wasn`t being charged for a long period of time. In this case, the screen will not turn on.
To charge : simply plug the timer to a power outlet. The charging time should take at least 15 minutes.
If the screen doesn`t light up or displays garbled characters, simply reboot the system by pressing the [RESET" button.
3. Set clock
Hold [CLOCK" button and [WEEK" button to adjust week.
Hold [CLOCK" button and [HOUR" button to adjust hour.
Hold [CLOCK" button and [MINUTE" button to adjust minute.
Hold [CLOCK" button and [TIMER" button to select 12 hour/24 hour display.
Hold [CLOCK" button and [ON/AUTO/OFF" button to enable/disable DST (daylight-saving-time).
4. Set timer
Press [TIMER" button, select and set timer. Setting rotation : 1on, 1off, 2on, 2off, ...... , 10on, 10off.
Press [HOUR" button to set hour for timer.
Press [MIN" button to set minute for timer.
Press [WEEK" button to set weekday for timer. Multiple weekdays can be selected. ex: if selected [MO", the timer will only apply on every Monday; if selected [ MO, WE, FR", the timer will apply on every Monday, Wednesday and Friday.
Press [RES/RCL" button to cancel the selected on or off timer. The screen will show "-- -- : -- --" , the timer is canceled.
Press [RES/RCL" button again to reactivate the timer.
When timers are set, press [CLOCK" to quit timer setting and return to clock.
5. Random function
Press [RANDOM" button to activate random function, press again to cancel function.
System only runs random function when [AUTO" is on.
Random function will automatically start the timer from 2 to 32 minutes after the setting.
ex : if timer 1on was set to 19:30 with the random function on, the timer will activate randomly between 19:33 to 20:03.
if timer 1off was set to 23:00 with the random function on, the timer will activate randomly between 23:02 to 23:32.
To avoid overlapping, make sure to leave a minimum of 31 minutes gap between different sets of timer.
6. Manual control
Displayed features:
ON : socket turns on.
OFF : socket turns off.
AUTO : socket turns on/off automatically via timer.
Manual ON setting
Press [ON/AUTO/OFF" button to switch from [AUTO" to [ON".
This mode allows socket of the device to power up. Power indicator will light up.
Manual OFF setting
Press [ON/AUTO/OFF" button to switch from [AUTO" to [OFF".
This mode turns socket of the device off. Power indicators will turn off.
7. Electrical parameters
Operating voltage : 230VAC
Battery : NiMh 1.2V
Power consumption : < 0.9W
Response time : 1 minute
Power output : 230VAC/16A/3680W
Q&A
Q: Why won`t my timer turn on?
A: It`s out of battery, you can charge the timer by plugging onto any power outlet. Charge the device for at least 15 minutes. Then press [RESET " button to reset the device.
Q: Can I set seconds of the timer?
A: No, the smallest time unit is minute.
Q: Does my timer keeps old settings without being plugged onto a power outlet?
A: Yes, the timer has an internal battery, it allows the timer to save settings without a power outlet.
Q: Is the battery rechargeable?
A: Yes, the battery is rechargeable. We recommend to charge it for 4 hours so the battery is fully charged.
Q: Does the timer needs internet connection?
A: The timer does not need internet.
Q: Does the screen have back light function?
A: It doesn`t support back light.
digital timer, digital timer socket, electronic timer socket, timer socket
NINGBO COWELL ELECTRONICS & TECHNOLOGY CO., LTD , https://www.cowellsocket.com