Description

The N5 front-end fever front-end board is a front-end designed as a reference level for enthusiasts. It refers to the strengths of the people, and the improvement is slowly debugged and finally completed. The circuit architecture is from a circuit that everyone is familiar with, and the filter circuit discards a single large capacity. Capacitors are used instead of capacitor arrays, so that the internal resistance of the power supply is lower

The voltage regulator processing circuit uses the class A power regulator circuit that fans have always admired to form a positive and negative voltage to power the op amp. The output current is doubled, which solves the problem of small output current of the front stage of the op amp, so that the front stage of the op amp can reach the output current of the discrete circuit, and the consistency and parallelism are far greater than the discrete components. The indicators are very consistent

Mature circuit design, although to a certain extent, it can’t be said that there is any great and special place, but with good use, and with careful design and debugging, it is not difficult to produce good sound. Generally, the circuit with good sound is often this circuit. , Such as Class A power supply, parallel op amp output, these high-cost designs can only be done by fans, but in fact, the high cost will bring a better sense of hearing, sound thickness and control. Will be much better than the output of a single op amp

The high-frequency reproduction is not harsh and obvious, and the dynamic retracts and releases freely. There is no looseness. The addition of capacitor array and Class A power supply makes the sound always listenable. The performance of the human voice is generally very satisfactory. Feeling reluctant to shut down

There is an op amp seat on the board, you can easily replace various op amps according to your own listening experience

Product name: N5 pre-fever pre-board (finished board tested well)

Product dimensions: length 100MM * width 100MM * height 25MM

Input voltage: dual 12-18V, (can be adjusted left and right within a small range of dual 12-18V)

Magnification: 5 times

Simple wiring, no circuit diagram

The standard version uses 5532 5 op amps

The upgraded version of the finished board is well tested (the op amp is equipped with 2604 5)

These 4 tertiary tubes with heat sinks are composed of a Class A regulated power supply, and the temperature is a bit high, it is basically hot, and it is also one of the keys to good sound.

All fever components and German Hongwei code capacitors

The upgraded version uses one 2604 for amplification and four 2604 op amps for parallel current output