CXA1019 FM RADIO
CXA1019 is a one-chip FM/AM radio IC designed for radio-cassette tape recorders and headphone tape recorders, and CXA1019S has the following functions.
CXA1019 Features
- Small number of peripheral components.
- Low current consumption (Vcc=3V)
For FM: I0=5.3 mA (Typ.) - Large output of AF amplifier.
Vcc=6V, EIAJ output=500mW (Typ.) when load impedance 8Ω.
Functions FM section
- RF amplifier, Mixer and OSC (incorporating AFC variable capacitor).
- IF amplifier
- Quadrature detection
- Tuning LED driver
CXA1019 Structure
- Bipolar silicon monolithic IC
| PARTS LIST | |
| R1 | 100KΩ |
| R2 | 2.2KΩ |
| VR1 | 50KΩ Volume Control |
| D1 | Red Colour LED (Tuning Indicator) |
| C1 | 15pF |
| C2 | 4.7µF |
| C3 | 4pF |
| C4 | 0.02µF |
| C5 | 22pF |
| C6 | 20pF |
| C7 | 100pF |
| C8 | 22pF |
| C9 | 0.01µF |
| C10 | 220µF |
| C11 | 4.7µF |
| C12 | 10µF |
| C13 | 1µF |
| C14 | 0.27µF |
| C15 | 1000pF |
| C16 | 100µF |
| C17 | 0.1µF |
| C18 | 100µF |
| FM T/C | FM Tuning Capacitor (15-30pF) |
| IF | Orange Colour FM IF Transformer |
| CF1 | 10.7 MHz FM Ceramic Filter |
| L1 | 2¾ (2.75) Turns of 22 swg enamelled copper wire close-wound on a 5mm diameter. |
| L2 | 3¾ (3.75) Turns of 22 swg enamelled copper wire close-wound on a 5mm diameter. |
| Aerial | Telescopic Aerial OR 100cm Circuit Wire |
| SP | 2W 8Ω Speaker |
| IC | CXA1019 s |
SONY CXA1019S
Block diagram
TUNING CAPACITOR
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| In this circuit diagram we have mention about FM tuning side only.When we assemble the Tuning Capacitor, we must be careful to select correct side of tuning capacitor.Normally in the FM side of the tuner middle pin and other pin capacitance will be nearly 15pF to 40pF. Middle pins: B and F, FM side:A,B, C in this photo. |
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10.7 MHz Ceramic Filter
CXA1019 TUNING COILS
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| 2¾ (2.75) Turns of 22 swg enamelled copper wire close-wound on a 5mm diameter. | 3¾ (3.75) Turns of 22 swg enamelled copper wire close-wound on a 5mm diameter. |
IF Transformer
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| 1 and 3 pins used to this circuit. | ||
CXA1019 PCB
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| width=7.95 cm Height=4.90 cm |
width
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