The simplest miniature megaphone ----- Simple Amplifier

The simplest miniature megaphone, Simple Amplifier Keywords: the simplest micro-megaphone We use the carbon strokes removed from the old telephone, as well as several common electronic components, which can be assembled with a uncomfortable structure is quite simple, and the simplest micro-megaphone that is clear and loud and loud, very interesting. . There is quite good in some small spatial sounds. The specific circuit diagram is shown in the drawings. Component Selection: The carbon crystal handler removes from the old-fashioned telephone handset, high-power triode uses 3AD17, or 3ADL8. However, in order to reduce the noise generated during the amplification, the triode requires the penetration of the current to minimize as much as possible, but the value of the tube is magnified, and it should generally be more than 70 more. The speaker and output transformer use the transistor radio, the power supply battery is 6 volt stacking batteries, and the rechargeable battery and the rectifying power supply are also available. Installing a printer: Welding several components on the long-shaped printed circuit board, find a flashlight of the plastic housing, rotary electric shroud removed the glass, reflective hood and small electric beads, then send carbon crystals The phone is installed in the cover and welded the sender lead to the board. Two of the 3mm holes in front of the front end of the electric torch, one of the micro power button switches and two-core sockets, and after all wiring is welded, the battery is plugged into the electrosphere, and finally The phone's electrical head cover is completed. When the audition is inserted with the speaker lead plug into the front end socket of the flashlight, turn on the power switch to the quasi-sender speaker to pass the flood expansion sound. (Reader If you are interested in connecting the music integrated block circuit in the circuit, it makes it a voice, and the player is used. In debug ambiguity, if the speaker is a little distortion, dull or feel the volume is not big enough. The resistance value of the R1 can be adjusted appropriately, and the sound is toned to listen until the sound quality is not disturbed.

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