Phone modification. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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A small refinement of the phone with a carbon microphone according to the scheme in fig. 1 will save owners from strong interference in the form of cod due to the poor quality of the microphone capsule. When connecting this circuit to the device, the polarity must be observed. The transistor gain should be in the range of 10-15, but if it is greater, then it is necessary to select the resistance of the resistor R1.
The refinement, assembled according to the scheme in Fig. 2 does not require polarity, but the board with it must be placed in the tube under the microphone.
Author: K.Kuzmich-Yanchuk, Kiev; Publication: N. Bolshakov, rf.atnn.ru
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