Ordering guide:
Optional1. Bare PCB2.DIY kit (including all the parts in the picture), welded by you.3.The finished board, it has been welded and tested.
Monitor type adjustable multiples and fever pre-stage (both the parts package and the finished board contain 3 instrument-level dual op amps opa2277)
The circuit and parts are adjusted for opa2277 development and design. Replacement of the op amp does not improve the quality, but the rendering error The overall design of the adjusted circuit, please do not change the original design configuration.The magnification can be adjusted:Switch ON1/3.7 times;Switch ON12/ 5.5 times;Switch ON123/7.3 times;Switch ON1234/8.8 times.See clearly the direction key of the op amp installation (port symbol is 1 pin) / 5 pin resistance O symbol is 1 pin. The long leg of the polar capacitor is + poleTransformer power 10 watts 50 watts range, secondary voltage can range from dual AC/12v to dual AC/18v (please configure yourself separately)The circuit board can be soaked in pure alcohol for ten minutes to scrub.The pcb size is 100mmx100mm, and the thickness is 2mm. The default capacitor height of the finished board is 25mm.Suitable for matching with high-end quality power amplifiers A monitoring style that does not rely on rendering to conceal defects Good control driving force and low-loss long-distance transmission are not picky about the signal line of the machine, and there is no cold and dry sound of the transistor machine. It is not recommended to choose this preamp if the power amplifier is too lowDesigned and debugged with 30 years of fever experience. Monitoring concept Pursue accurate sound base, both musicality and acousticsThis product is a spare part or needs to be welded by yourself. It is sold to customers with considerable technical foundation testing capabilities When it comes to the personal safety of electrical installation, we have the right to refuse to sell to customers with poor basic knowledge Once this product is sold, there is no return and after-sales service, only technical consultation is providedInstallation order of welding parts / small resistance-row resistance-DIP switch-ic seat-large resistance-diode-green capacitor-black 1uf capacitor-gold 100uf-black 270uf-7x12 radiator-indicator light-power socket-large capacitor / check Power-on test without errors/completedThe volume potentiometer is type A, ranging from 10k to 100k Choose to choose as low as possible, and 10k can be used for audio sources with high signal strength. Please configure the potentiometer according to your own system(Silver capacitors are shield-marked black diamond peeling, which is a bit more costly than the gold capacitor Ritong NTK. The filter capacitor before voltage regulation does not affect the sound)