[Photo] Computer microphone circuit diagram

The sound card for a PC generally has a microphone input, speaker output and someTImes line inputs and outputs. The mic input is designed for dynamic microphones only in impedance range of 200 to 600 ohms. Lazar has adapted the sound card to use a common electret microphone using this circuit. He has made a composite amplifier using two transistors. The BC413B operates in common emitter to give a slight boost to the mic signal. This is followed by an emitter follower stage using the BC547C. This is necessary as the mic and circuit and battery will be some distance from the sound card, the low output impedance of the circuit and screened cable ensuring a clean signal with minimum noise pickup.

The world premiere of the technical zone! ROHM has developed the power supply IC "BD372xx series" for high-quality audio. A practical guide for the purchase of home wireless routers. Understanding the circuit diagram and working principle of the audio. Talking about the "frequency response curve" in the audio. Deep dismantling report of the M0pro speaker: both internal and external

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Photocell Timer Switch Socket

24HR Electronic timer socket with photocell.

â‘ Light intensity setting

â‘¡ Light intensity detection

â‘¢ Countdown Timer ON & OFF

â‘£ 4 MODES:

Set > Detected: When the light intensity detection value is less than the set value, switch ON or OFF.

Detected > Set: When the light intensity detection value is greater than the set value, switch ON or OFF

ON : Always ON

OFF : Always OFF

NOTED:

1. The light intensity displayed by this machine is not the standard light intensity value (Lux), only the relative light intensity value.

2. The light intensity value is affected by the placement position and direction. Please determine the position first and then set it according to the actual light intensity detected. If you change the position or change the orientation, you need to reset the light intensity setting value suitable for the new position.

3. This product has built-in rechargeable battery. If it is not connected to AC for a long time, you need to connect the power supply to charge until the LCD can display normally.

MANUAL OPERATION

1. Press [UP" or [DOWN" to set the LUX value.

2. Press the [SET" key to start setting, and the P1 settable items will be flashed.

3. Press [UP" or [DOWN" to adjust the value.

4. Press [SET" key again to exit setting or enter next setting for countdown timer.

5. Repeat the [SET" key to start setting, and the P2 & P3 settable items will be flashed.

6. Press the [FUN" key to switch the working state in the following:

Set > Detected -> Detected > Set -> ON -> OFF

Set > Detected: Automatically switches when the detected ambient light intensity is darker than the set value

Detected >Set: Automatically switch when the detected ambient light intensity is brighter than the set value

When the brightness meets the setting conditions, the countdown starts as below:

Note:when the countdown is ON, the detected value is not displayed.

When the brightness does not meet the setting conditions, the countdown stops and waits:

After the countdown ON is reduced to 0, the countdown OFF starts immediately and the power is OFF.

After the countdown OFF is reduced to 0:

A. If the light intensity meets the set conditions, a new round of countdown will be started;

B. If the light intensity does not meet the set conditions, keep the power off and wait for the light to meet the conditions before turning on automatically.

NOTE:

1. If the power is cut off while the countdown is running, the countdown will be terminated immediately and the relay output will be off. After the power is turned on again, a new round of brightness detection will start.

2. Modifying the brightness value in the countdown operation will not affect the current countdown operation. After the off time of the current countdown, the new brightness setting value will take effect.

3. In the countdown on operation, change the setting value of the countdown on, this countdown will still be timed according to the original setting value; the new setting value will take effect when the next countdown on starts.

4. In the countdown off operation, change the setting value of countdown off, this countdown will still be timed according to the original setting value; the new setting value will take effect when the next countdown off is started.

NOTE: the brightness setting value, countdown ON or countdown OFF, any one of which is equal to 0, cannot be switched ON or OFF automatically.

Manual Control

When ON or OFF is displayed, it means that the power supply remains ON or OFF, as shown in the figure below:

Power Detection and Standby Mode

With AC power supply, the icon lights up and works normally.

When there is no AC power supply, the icon goes out, the brightness is not detected at this time, and the system enters the standby mode.

Photocell Timer, Photocell Timer Socket, Photocell Sensor, Photocell Sensor Socket, Sensor Plug, Sensor Switch Socket, Digital Photocell Timer, Digital Sensor Timer

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