Add a megaphone function to the radio, CXA1019
Keywords: cxa1019, radio installed amplification function
Be
Author: Heng
The radio of Sony CXA1019 series chips can be easily modified into MP3 loudspeakers. This modification is not only practical, but also fun, the radius of the radio is large, the sound quality and volume are significantly better than the micro speaker of the mobile phone or MP3. The inner circuit of the CXA1019M / P / S contains a modulation, and the FM radio inputs all functions from the antenna to the audio amplifier output, which is commonly used single-chip radio circuit. Among them, the M-type uses 28 foot flat packages; the P-type uses a 28-foot dual-column-in-in-in-pack package; the S model uses a 30-foot dual-column-in-in-packet package, but its inner circuit is the same. The recommended power supply voltage of CXA1019m is 2-7.5 volts. The recommended power supply voltage of CXA1019P / S is 2-8.5 volts. When the supply voltage is 3 volts, its static operating current is 5.3 mA (FM) and 3.4 mA (AM); At a power supply voltage of 6 volts, the speaker impedance is about 8 euros with an audio output power of about 0.5 watts. The highest withstand voltage of CXA1019 is 9 volts, allowing power consumption to 0.7 watts (M-M-type) and 1 watt (P / S) type. The modified radio model is a bonfire FH-90 tape TV sound receiving function.
Molded materials: 1. Two-channel headphones socket, 2. φ3.5mm plug audio connection, 3. Old earphone cable, 4. 6.2K (8.2K or 10K) of the resistance 2 Piece. Modification process: Turn the radio's chip 23, 24, 27 foot circuits as chart modified. Circuit Principle: 23 Features is the radio signal output of the radio, and the audio input 24.27 that is coupled to the audio power amplifying circuit after the normally closed contacts of the headphone socket is the active amplifier output, and the speaker is pushed through the 220 microcontroller. The difficulty of the entire modification is the fixation of the double-channel socket, heating plastic fillet with a proper amount of glue or re-opening, and welded, the original headphone socket can be utilized for a double channel. The newly added circuit should be posted on the transparent tape insulation to prevent short circuits during assembly. Insert the two plugs of the 3.5mm plug audio cable inserted into the MP3 player and the radio (automatically disconnect broadcast signal at this time), open the radio and adjust to the medium band, no program (the most power consumption of the radio) The volume switch adjusts the radio and MP3 can be used as MP3 ambidum, and the radio function can still be used normally after unplugging the audio.
Be
At present, although the Deman CR200 radio on the market also has powerful MP3 amplifier, charging function, but only external AC power can be used. The other CR1000 of De Sheng can also be used by MP3 loudspeakers. It can be powered, regardless of which power supply MP3 loudspeaker, when the MP3 connecting the metal housing, generate noise when the button is pushed, and the MP3 side can be used. The audio plug is slightly removed or the digital signal is isolated from the audio ground line or the audio layer, and the MP3 loudspeaker can avoid hearing loss, and the MP3 standby time can be extended.
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