| 摘要 |
PURPOSE:To improve the rise immediately after the make of the power source by installing the switching transistor in parallel to the decoupling resistance. CONSTITUTION:With the make of power switch 15, switching transistor 10 is turned on since it is biased via resistance 14. Thus decoupling capacitor 8 is charged quickly, and the preamplifier gets under the operative state in an extremely short time. On the other hand, capacitor 12 is also charged via resistance 13 to turn transistor 11 on in a fixed time. Accordingly, the base of transistor 10 is earthed to turn off transistor 10. But hereafter, the power is supplied to preamplifier 2 via decoupling resistance 9. |
