Acoustic circuits usually include capacitors such as filtering, coupling, bypass, and frequency division. How to effectively use various types of capacitors in the circuit has a greater impact on the improvement of acoustic sound quality.
Coupling capacitance
The capacity of the coupling capacitor is generally between 0.1μF-10μF. The use of mica, polypropylene, ceramics and other small loss capacitors has better sound quality. The main brands are:
1. German WIMA capacitor: It is characterized by fast speed, low loss, natural sound quality balance, cold tone, suitable for a variety of listening requirements. There are many varieties of WIMA capacitors, the best is Black Box, followed by MKP and MKS. Nowadays, most of them are disassembled products, and the price is not expensive. The other is the German ERO capacitor, with characteristics similar to WIMA.
2. French SOLEN capacitor: rich and soft tone, full of musical sense. Too hot equipment is suitable for supplementing with SOLEN. The most outstanding performance is that the loss angle tgδ is particularly low, which is worthy of being the world's ace polypropylene capacitor!
3. RIFA (Australia and Sweden) capacitor: This capacitor is the most suitable for the complementary frequency divider, and has strong penetration power for high frequency.
4. Dutch Thomson MKP capacitors: sound quality is naturally balanced, and the mid-to-high frequency is relatively rich. Closer to WIMA capacitor.
Preamplifier, crossover, etc.
Capacitors used on preamplifiers, audio controllers, and electronic crossovers have a capacity between 100pF-0.1μF; mica and styrene capacitors are preferred.
The speaker crossover LC network generally adopts a capacitor with a larger capacity between 1μF and several 10μF. Currently, MKP, MKT and CBB capacitors are used in high-end crossovers. The capacitor used in the LC network has a larger capacity. Metalized plastic films or non-polar electrolytic capacitors should be used. Among them, if the inorganic electrolytic capacitor is non-etched, it can obtain excellent sound quality.
Filter capacitor
After rectification, the capacitor for filtering has a large capacity, so electrolytic capacitors must be used. When the filter capacitor is used in the pre-amplifier, the capacity is only about 1000μF. When it is used in the power amplifier, its value should be more than 10000μF.
When the power supply filter circuit directly supplies the amplifier to work, the larger the capacity, the better the sound quality. But a large-capacity capacitor will cause the impedance to rise from around 10KHz. In this case, several small capacitors should be connected in parallel to form a large capacitor and several film capacitors should also be connected in parallel as high frequency compensation. Next to the large capacitor to suppress the rise of high frequency impedance, the parallel connection of the filter circuit capacitors is shown in the following figure:
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Power Meter is a monitoring and testing instrument which determines the power consumption of a connected appliance and the cost of the electricity consumed.
Installing the batteries
Install 3.6V rechargeable Battcrics(NI-MH) . The purpose of the batteries is to store the total electricity and mcinory setting.
Resetting
If an abnormal display appears or the buttons produce no response, the instrument must be reset. To do this,press the RESET button.
Display Mode
Entire LCD can be displayed for about 1 minute and then it automatically gets into Model. To transfer from one mode to the other, press the FUNCTION button.
Mode 1: Time/Watt/Cost Display Display duration(how long) this device connect to power source.LCD on first line shows 0:00 with first two figures mean minutcs (2 figures will occur while occur at 10 min) and the rest shows seconds. After 60mins, it displays 0:00 again with first two numbers meas hour(2 figures will occur at 10hours) and the rest shows minutes. The rest can be done in the same manner which means after 24 hours, it will rc-caculatc. LCD on second line displays current power which ranges in 0.0W~9999W. LCD on third line displays the current electricity costs which ranges in 0.0cost~9999cost. It will keep on O.OOcost before setting rate without other figures.
Mode 2: l ime/Cumulative electrical quantity Display Display duration(how long) this device connect to power source.
LCD on first line shows 0:00 with first two figures mean minutes(2 figures will occur while occur at 10 min) and the rest shows seconds. After 60mins, it displays 0:0() again with first two numbers meas hour(2 figures will occur at 10hours)and the rest shows minutes. The rest can be done in the same manner which means after 24 hours, it will re-caculate. LCD on second line displays current cumulative electrical quantity which ranges in 0.000K WH 〜 9999KWII without other figures. LCD on third line displays''DAY''- "1 "will be showed on numerical part(thc other three figures will be showed at carry) which means it has cumulated electrical quantity for 24hours(one day). The rest can be done in the same manner untial the maximal cumulative time of 9999 days.
Mode 3: Time/Voltage/Frequency Display LCD on first line displays the same as Mode 1 dones. LCD on second line displays current voltage supply (v) which ranges in 0.0V~9999V .LCD on third line displays current frequency (HZ) which ranges in 0.0HZ~9999HZ without other figures.
Mode 4: Time/Current/Power Factor Display LCD on first line displays the same as Mode 1 dones.
LCD on second line displays load current which ranges in 0.0000A~9999A. LCD on third line displays current power factor which ranges in 0.00PF 〜 1 .OOPF without other figures.
Mode 5:Time/Minimum Power Display LCD on first line displays the same as Mode 1 clones. LCD on second line displays the miniinum power which ranges in 0.0W~9999W. LCD on third line displays character of "Lo" without other figures.
Mode 6: I,ime/Maximal Power Display LCD on first line displays the same as Mode 1 dones. LCD on second line displays the maximal power which ranges in 0.0W~9999W. LCD on third line displays character of "Hi" without other figures.
Mode 7: Time/Price Display LCD on first line displays the same as Mode 1 dones. LCD on third line
displays the cost which ranges in O.OOCOST/KWH 〜 99.99COST/KWH without
other figures.
Overload Display: When the power socket connects the load over 3680W, LCD on second line
displays the"O VER LOAD" with booming noise to warn the users,( 60470643,
60469303,selectable choice)
Supplemental informations:
1: Except tt OVERLOAD , ' interface, LCD on first line display time in repitition within 24hours.
2: LCD on first line, second line or third
line described in this intruction take section according to two black
lines on LCD screen. Here it added fbr clarified purpose.
3. Mode 7 will directly occur while press down button "cost".
4. [UP"&''Down" are in no function under un-setting mode.
Backlight Mode:
Connect to AC power,backlight im mediately light,if not press any button,backlight will went off in 15 seconds.
When press any of the buttonsbacklight
start light again. (Backlight only light when it connect to AC
power,backlight cannot light if use battery)
Setting Mode
1. Electricity price setting
After keeping COST button pressed lasting
more than 3 seconds(LCD on third line display system defaults price, eg
O.OOCOST/KWH ),the rendered content begins moving up and down which
means that the device has entered the setting mode. Then press FUNCTION
button to change selection and press UP/DOWN to set what you want. (On
pressing once, the figure after domical point will increase or decrease
accordingly. On pressing and hold-on, figures after demical point will
increase or decrease slowly in 2 seconds while figures change quickly
when hold-on time exceeds 2 seconds. When hold-on time reaches 10
seconds or more, the figures after demical point will stop while the
figures before demical point begin to increasing or decreasing.) After
that, press FUNCTION fbr swithing, then press [UP'nd "DOWN" button again
to set value which ranges in OO.OOCOST/KWH 〜 99.99COST/KWH. After
setting all above, press COST to return to Mode7 or it will
automatically return to Mode7 without any pressing after setting with data storage.
Power meter double rates, power meter two rates, cost rate socket, power meter cost rate, energy meter cost rate, cost socket, cost plug
NINGBO COWELL ELECTRONICS & TECHNOLOGY CO., LTD , https://www.cowellsocket.com