47 amp is a well-known classic amp circuit. Because of its simple structure and good sound, it is loved by the majority of fans. The power supply voltage is double positive and negative 9-15v.
Price: Military-grade pcb board 4.5 yuan/piece, without parts. The kit parts are 18 yuan/set.
Features of this amp:
1. Based on the original 47 circuits, combined with improvements in portability, the sound quality and stability of this amp have been comprehensively improved
2. This kit all uses high-quality genuine components, each component is brand new, and the quality is guaranteed.
3. The wiring of the amp PCB circuit board is reasonable, and it is made of high-quality military-grade board, which is actually a high-quality PCB.
4. The input and output are all ordinary 3.5 earphone sockets, just plug in the pair of recording cables, which is extremely easy to use.
5. It adopts a full-line component design and is equipped with a DIP-8 fever chip socket, which makes it extremely simple to upgrade the chip.
6. Price advantage,The price of a set of 18 yuan is definitely the price of cabbage, So that the shy fans in the pocket can also play the classics.
Buyers'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' praise
Military gradePCB empty board,Size: 8.3*4.2 cm,Price 4.5 yuan/pieceWithout parts
Kit parts, Assemble it yourself,Price 18 yuan/set
Finished product, Without power supply,Price 29 yuan/set
47 amp principle diagram:
The first stage op amp is used as negative feedback to control the magnification
The second op amp follows the voltage to increase the output current and make sound modification
Supply voltage:Plus and minus 9V-15V 12v recommended, you can use two 9V stacked batteries.
Product does not include 9v battery and cable
The product does not include 9v battery and cable, if you need 9v battery cable, please purchase separately