Simple and easy three-tube headphone amplifier ----- Headphone Amplifier

Simple and easy three-tube headphone amplifier, Headphone Amplifier Keywords: Simple and easy three-tube headphone amplifier Simple and easy three-tube headphone amplifier The author is based on the principle of less spending money and carry forward the DIY spirit of his own hands, and designs the three-tube headphone amplifier. The design principle of the entire circuit is to achieve a simple and sound and charming effect with as little components. The principle of circuit is shown in Figure 1. The 6N3 co-amplification and 6N6X2WCP mode is used, and 6N3 uses J-level disassembly tube, and 6N6 uses new T-level tubes. Electrolytic capacitors use Japanese EL31A high-speed tonic capacitors, non-polar capacitors, Tang Su Jun MKP capacitance, resistance to five-color ring metal film resistance, potentiometer is ALPS, all of which use high quality gold-plated sockets. The 180V anode voltage and 6.3V filament voltages were regulated. The original 6.3V is directly output by LM317. Later, the LM317 is not allowed to eat, less booting in less than 2 minutes, immediately put into protection, and then add a high power tube Extended current output, and an unmatched radiator is installed, and the heat sink temperature is about 40 ° C after booting half an hour. Since the power supply part (the electronic newspaper) is more discussed, therefore will not be described here. The whole machine is designed with a power supply and an amplifier, and the casing is used in a waste optical drive housing, and the inner is used in shed welding. 6N6 It is fever in itself, so it is also normal. After the formation is shown in Figure 2. The entire circuit distortion is relatively low, and the total harmonic distortion measured by RMAA5 and innovative CT4700 is 0.006%, and the frequency response is flat. Since the electronic pipe is used to enlarge the device, the actual audition sensation sound is warm, the medium is very gorgeous, smooth, low frequency is slightly poor (relatively high frequency), but it is also satisfactory, it is also satisfactory, and it is also in place for the strength of low impedance headphones. The advantage of WCF connection relative to SRPP.

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