The board of the shop are designed to produce (can also be customized according to customer requirements of the board), a small amount of purchase can be photographed directly, the bulk purchase price concessions, welcome to contact.
Ultra low noise electret microphone head pole amplifiers using ST, imported K472 electret microphone special amplification chip, chip with low noise. Adjustable gain, wide power supply advantages than MAX9812 at the end of 14, lower noise, differential output, or single output.
Gain adjustment:R3 is the resistance gain adjustment resistance, is the default 30dB shipments (values of 1K), if not suitable, can refer to the table to change the value of R3 to obtain different gain resistance to change the original off chip R3 (if not good patch welding, can also be used to insert the welding in the next R3 two reserved pad above (the gain is 0-40db variable).
Microphone connection:Microphone head positive electrode, negative electrode, the board on the GND when the shield with, do not connect microphone head (also can not pick up, but it is best to take a look, to avoid interference)
1: differential output: pick up the signal +, -, the middle is GND ground.
2: single ended output: pick up signal +, middle GND ground.
3: two channel output: signal + when a channel, the signal – when a channel, the middle GND ground
3 output connection methods can be selected according to the needs
Working voltage: DC 2.3v-5.5v
Board size: 25mm*20mm
Note: the board power supply is best not to use the switch power supply, or low noise from the bottom of the talk, the interference may be serious.
1: receive the goods have any questions please contact us to solve, do not take the middle. Bad to treat, or the shop will refuse technical advice and after-sales service.
2:Store commitment7Days no reason to return,30Day free warranty, if the quality problem, requires replacement, round-trip freight borne by the buyer; non quality problems return requirements, not only the freight back, backPayment (return of the goods will not affect the two sales, or the store will be rejected), the warranty period of the problem, the seller and the buyer to bear the shipping charges. For self disassembly.Refit.operationCaused by the issue of the need for warranty, back and forth from the buyer to bear, if involved in precious parts, the shop will charge the basic costs of parts;
3: goods are real pictures, picture color may be due to the camera.Shooting environment and other factors produce color, baby color in kind prevail:
4:Each item has the relevant parameters of the note, because of different measurement methods,Commodity parameters may have a certain error;
5:Please sign for the parcel notice integrity of packages, such as parcel damaged please contact us (visa, and contact telephone number on the parcel there), and to test the condition and quantity of goods, if you have a receipt that the goods look no problem; after the retreatReplacement freight borne by you;
6:If you have any questions about the use of the goods, please feel free to contact us. We will give you a satisfactory answer;