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Service Manual - Adcom GFA - Amplifier -- dsm title.STAY IN TOUCH
Read or download the pdf for free. If you want to contribute, please zdcom your pdfs to info audioservicemanuals. NJ raamous This service manual is intended to assist trained and qualified technical personnel in verifying the performance of, adjusting, and repairing the ADCOM GPA power amplifier.
The procedures described here are not intended for persons unfamiliar with the appropriate satety and test procedures. The output stage is capabie at greater than 60 amps into low-impedance loads. This high-voltage signal drives the high-current tripieADarlington-follower output stage which amplifies the current by a factor of читать больше 50, Referring to the accompanying schematic, the input signal passes through network, R, and R which provides a 3dB bandwidth of0.
C is adcom gfa-565 service manual extremely high quality capacitor and serves to protect the amplifier and the speakers connected to it from DC faults at the outputot the preampiitier. Adcom gfa-565 service manual 08, R R1 12, and R provide local teedbackto control the input-stage open-loop gain. The next voltage-gain stage consists of and Qt 11 on one side and and on the other. DC bias is set by R, D throughR R, and R Open-loop gain is defined by R, R R, and R, with R through R,and C providing high-frequency compensation.
Feedback is provided from the output to the bases of and by the network R, R, and Ct C provides a high-frequency rollotf above BOkHz,D, through 01 12, 01 1 3, adcok 14, R1 22 идея brushes adobe photoshop cc free этом R For example, when the cascode voltage gain stage approaches saturationto the positive supply, Ссылка на страницу beginstoconduot,turningn.
Currenttlowsthrough D The input stage is biased by R through R, through , through D, and D A current of about 2mA flows through the thermal gfa-655 on the heatsinks and into the emitter of O1 1 9. When is carrying the current, 01 15 is biased at 2. This creates about 1. Qt 18 then adcom gfa-565 service manual about 3mA through D1 14, which develops about 2. About t. D develops about 2. Any DC error at the amplifier output is servoed back through I61 01 to adiustthe DC current through the inputtransistors.
DC bias is nominally 1. The bias network adcom gfa-565 service manual R1 Bathrough R, and tormsatemperature-compensated DC-bias voltageto gaf-565 input of the lripie-Darlington-Ioiiower output stage. Adcom gfa-565 service manual and high-trequency bypassing is provided by C Previous Next. Download Adcom gfa-565 service manual. NJ raamous FAX
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