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Frigate

®

Headphone Amplifier With

Two 6922 & Two 6H30Pi Tubes

Augustica

®

T e c h n o l o g i e s

w w w . a u g u s t i c a . c o m

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Содержание Frigate

Страница 1: ...Frigate Headphone Amplifier With Two 6922 Two 6H30Pi Tubes Augustica T e c h n o l o g i e s w w w a u g u s t i c a c o m ...

Страница 2: ...ed to slowly power up the power supply of the kit as it is better to have a misoriented electrolytic capacitor or a mislocated resistor blow at low voltages rather than at high voltages Once the power supply is powered up be cautious at all times In fact even when the power supply is disconnected or shut down assume that capacitors of the power supply will have their high voltage charges retained ...

Страница 3: ...lifier guarantees a highly linear frequency characteristic and low crosstalk between the left and the right channels The headphone amplifier Frigate employs a two stage design suitable for use with a single or dual headphone with each headphone element having impedance between 15 and 300 Ω for the total impedance of 30 to 600 Ω AMPLIFIER THEORY OF OPERATION The circuit of the headphone amplifier F...

Страница 4: ...sections of 6H30Pi is fed to the headphone via coupling capacitor C6 Resistor R17 holds the output at ground potential for DC signals in order to avoid crackling noises when the headphone is plugged into stereo jack POWER SUPPLY THEORY OF OPERATION The power supply for the headphone amplifier Frigate is shown in Figure 2 The power supply uses two transformers not shown on the schematic The first t...

Страница 5: ...nally additional smoothening of the filament DC voltage is provided by capacitors C19 and C20 of the power supply Green LED D14 serves not only as a pilot light but also together with resistor R7 provides a minimum load and ensures that the high capacitance capacitors C15 C16 C17 C18 C19 and C20 are discharged once the power supply is switched off even if no load is connected to the power supply D...

Страница 6: ...istors R1 and R2 of the power supply followed by capacitors C5 C6 C7 C8 C9 and C10 Solder red LED D7 and resistors R3 and R4 followed by terminal block K2 Connect a transformer or variac to the terminal block K1 again and slowly bring voltage to 220 Volt AC Measure the high B plus DC voltage at the terminal block K2 produced by the high voltage bus of the power supply as a whole If you applied 220...

Страница 7: ... heatsink Once you attached the LD1084V to its heatsink you can insert heatsink leads and LD1084V leads into the power supply PCB Solder the IC3 regulator s leads to the PCB At this point do not solder the heatsink s leads to the PCB you will do it later Eighth solder the rectifying bridge D15 D18 and capacitors C21 C22 C23 and C24 Pay attention to the polarity of the rectifying bridge D15 D18 Sol...

Страница 8: ...eadphone amplifier Frigate Start with the tube sockets followed by the resistors capacitors and diodes Before testing the headphone amplifier Frigate visually inspect the amplifier s PCB for breaks in symmetry between the left and right channels TESTING First attach only low voltage filament power supply s transformer leads to the terminal block K3 of the power supply s PCB leaving the other set o...

Страница 9: ...igh B plus voltage transformer leads to the terminal block K1 of the power supply s PCB and insert the 6922 and 6H30Pi tubes in their sockets on the amplifier s PCB Using wire connect the terminal block K2 on the power supply s PCB with the terminal block K2 on the amplifier s PCB Seventh bring up the AC voltage Eighth measure the voltage across ground and B plus pads of the amplifier s PCB in the...

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