☑ Germanium Transistor Headphone Amplifier

R3 2 x ss x load. Audiophile headphone amplifier kit audiophile headphone amplifier kit includes high quality audio grade components such as burr brown opa2134 opamp alps volume control potentiometer ti tle2426 rail splitter ultra low esr 220uf25v panasonic fm filtering capacitors high quality wima input and decoupling capacitors and vishay dale resistors.

Keeley Germanium Amplifier

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Input sensitive for rated output is 50mv.

Germanium transistor headphone amplifier. The first devices available were leaky germanium pnp transistors. What is crucial to this cross over distortion is the equality of the two halves. Complementary transistors with resistor bias.

Add a silicon diode in series with the other one. One time in the late 1980s i had an old tape player not the plastic ones with pushbuttons but one with kind of a lever. 1968 people were reportedly able to touch it.

This is hifi transistor headphone amplifier circuit uses the principle enlarges current of the transistor at the beginning by use 3 transistors. Crap leakage current too high. Crap power handling ptot too low.

Voltage limit vce too low. Crap junction temp too low. Which first perform be pre amp and next 2 again build model complementary which impedance of the circuit will that about 500 ohm and have amplifier rate 5 equal it give output power about 50 mw.

Electronics help care 418800 views. Crap bandwidth ft too low. Replace germanium diodes with silicon types.

Crap current handling capacity ic too low. As has been said already the be voltage of germanium transistors is about 02 to 03 volts whereas that of silicium is about 06 to 07 volts. A discrete 3w audio power amplifier circuit is shown in figure 1 employs a complementary output stage featuring the ac 187 ac188 t 3 and t 4 germanium output transistor pairs.

Complementary transistors with one silicon diode. How to add more transistor to amplifier. The basic problem is germanium transistors were are crap.

Complementary transistors with two diode bias. This amplifier can deliver a maximum of 3w into an 8w loads. Assuming load 8 w and ss 70 with no signal the r4 value should be equivalent to two junction drops.

But that has not much to do with the cross over distortion of a power stage with transistors. Crap gain hfe too low. But these days it is no longer so easy.

In the early days of solid state amplifiers thermal stability was the big issue. Transistor t 1 t 2 work as common emitters with t 1 driving t 2. The collector to base leakage was often so excessive that it could cause thermal run away because the leakage increased exponentially with temperature.

How to update old amplifier. There is a specific wah wah particular to germanium transistors.