The simplest DIY super imitation Goethe earphone amplifier circuit diagram

Single chip microcomputer STM32L151CCU6

Probe high current needle 120 needle head diameter is 3.0 threaded needle high current needle total length is

Photocoupler

The famous GRADO Goethe RA-1 headphone amplifier in the United States is believed to be known to many earphone enthusiasts, but its price of 3,000 yuan has made many people discouraged. Is such a simple thing really worth 3,000 oceans?
In the Western language, there is the word "simple is best". The main meaning of translating into Chinese is to say "simple and best". In the European and American audio design industry, there are also a large number of high-level audio designers who pursue the basic design principle of simple is best. Goethe's RA-1 is the essence of the sound design idea of ​​“Jane is good”. The circuit is very simple, even It can be described as "it is simple enough to be simple."
This time I will show you how to do Diy a super-simple Goethe RA-1 headphone amplifier circuit. Even the two 9V laminated batteries in the whole circuit counted only 13 components.