Principle circuit of simple LED voltmeter

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin
TP-IP4220CZ6 5V 0.35PF breakdown voltage 6V SOT
Shunuo varistor / ESD varistor / product complete / Sunlord first-class agent
SMD LED

As shown in the figure, the number of light-emitting diodes is used to display the voltage level of the voltage. The transient response is fast, and the internal resistance of the voltmeter is high, and the display is intuitive. When the measured voltage U is higher, the number of light-emitting diodes from the LED1-LED4 is increased. Adjust the resistance of the potentiometer W to adjust the starting voltage value of LED1 lighting.

Principle circuit of simple LED voltmeter



Mechanical Timer

24 hours mechanical Timer
Instant indicator
Min.setting time:15 minutes. Max.setting timer:24 hours
With hand switch,can be switched to operating and

setting at any time

Instructions:

mechanical timer
1. Set program: 1 pin is equivalent to 15 minutes. Determine desired start time and push down pins until desired
off time.
For instance, if you want electrical devices to work from 8:00am to 11:00am and from 13:00pm to 17:00pm, you
just need to put down allthe pins between the three period time.
2. Set the current time: Turning the dial clockwise until the arrow pointing to
current time.
For example,if now it is 8:00 am, please turn the dial and make sure the
arrow point to 8. (See the picture.)
3. Plug the electrical device directly into the timer. Make sure the electrical
device is power-on.
4. Plug the timer into electrical outlet and the electrical device will be work
according to the setting program.
Note: = Normal Ope n = Timing
Make sure the switch on the Timing position. If it
is on the [Normal Open" mode, the electrical device is
always power-on and the timer function no work.

Specifications:

Rated Voltage, Current and Power
As shown on the label
Time Setting Range
15minutes24hours
Working Temperature
-10℃?+55℃
Operation
Clockwise
Insulation Resistance
>100M
Inherent Loss
≤1W

Application:
1. To enable high-power electric appliances to run automatically at off-peak time if there is different electricity
price according to different periods of time in some areas.
2. To use for electric appliances which need time control, such as water heaters, air conditioners, drinking
fountains, rice cookers, advertising lights and so on.
3. To control the charging time. For example, battery of electric bikes or mobile phones, storage batteries, etc.
4. Occasions which need switch on/off frequently, like interval spray irrigation for flowersand lawn, cyclical
adding oxygen to fish jar, fountains and so on.
5. Home safety precautions and lighting.

Caution:
1.D o not exceed the maximum ratings of the timer.
2.M ust reset the current time after power failure.
3.D o not plug the timer directly into the working electrical appliances.
4.U nless changing the setting, keep the program same every day.
5.D o not disassemble timer by yourself. Professionals service are needed for maintenance.

6.T his item is only for indoor use.

Mechanical Timer, mechanical timer socket, 24hr mechanical timer, mechanical timer plug, mechanical timer adaptor

NINGBO COWELL ELECTRONICS & TECHNOLOGY CO., LTD , https://www.cowellsocket.com

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