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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an embodiment of
the device of the present invention. VR и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и bypass capacitor, S и и и и и и и и и и и ииearphone jack. ?????
Detailed Description of the Invention In the prior art, to the amplifier 0, a speaker is provided via
a resistor from the output terminal of the amplifier. 15 This process a @ uses, for example, a
volume adjustment resistor 11 with a large volume S round, distortion increases at a later stage
of the booster II, and it is simply lowered by a resistor to over 1 d-hbk A light that each other's
friends meet in a book that must be shipped in a state of strain that has increased. 9 Invented
part 1 In the case of build 1 ls, increase the gain by 2 иии in the appropriate stage and lower the
input to the amplifier at the post stage to obtain an output level that provides low distortion
amplification. It is a turtle that provides 11 charge. About one example of castle castle devise we
@ It! 11 will be described, I is an input terminal, VR is a volume control resistor 5C7 is a coupling
capacitor, R4 and R2 are resistors for appropriately biasing the base of a transistor Tr +, R5 is a
transistor Tr + Collector load resistance, R3 and R4?Pace bias bias resistance (with resistance
for ? ?, dust, c2Fi bias capacitor, S. And S2 to ? ?, ? ? ? ?, I I, when I inserted the ? ? ?
? ░ ? ? ? ? switch interlock switch. Normally, S connects a bypass capacitor C2 in parallel
to a resistor R3 and S2 connects the output of a general power amplification circuit after the
transistor Trz to a speaker S. When the phone plug is inserted, the bypass condenser C2 is
opened when the phone plug is inserted, and the earphone jack ?Yak I? is ?Il? in the power
amplification circuit. Now, the signal that has entered the ?transistor Tr + O pace through
Conden C7? is now T3. L, through coupling capacitor C2, into base of transistor Tt2 6. Further,
the transistor JTr2 is X-amplified and input into the one-phase inverting transformer T, and the
transistor Tr3. Operate Tz4 alternately and make it easy to use, and / 1 pull amplification. The
speaker s is driven 9. When the speaker sound is inserted, the switch S2 is turned off when the
plug in the dophone plug is inserted, and 1 * can be used to amplify the sound from the
headphone instead of the switch S in the book 497 and the bypass capacitor C2td resistance R3
is cut off. Stay in this (ro) road. If the voltage resistance of the transistor Tr + is closed and the
input resistance of the transistor Tr + is denoted by Zi, and the input / bias of the transistor Tr +
is denoted by R1.
Oh, the height of the work A is 1 1 ? ? 71 ░, where hio is the current amplification factor at
the ground of the work ITr +. Next, Sui, s-3, and the voltage gain of the 6th meeting Jj and 1-F
door. 41--h. , ? L ? ?, so that resistance R3 and transport ? ? ?, Zi??R1 + (1 + hi,) (R, +
R4) и and R4 are appropriately adjusted (from the speaker S to 1. The tophone can be made to an
appropriate sound cover ratio, and to. ? You can connect earphones or external amplifier
without doking lc @. I was blind. In addition to the above as a method to lower the gain, voltage
negative feedback is further applied to the emitter of the transistor #TI from the rear wing ? -0
Thus, according to the present invention, simply adjusting the gain of the amplification a simply
There is no need to add any other circuit elements to the switch as it is, and there is no need to
add a resistor etc., as before, dophone (in order to add a resistor) It's a degraded book, so it's a
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