We design our receiver based on Toshiba TA datasheet and later we try TA and CD with same circuit. Either CD or TA CDGP Datasheet PDF – FM/AM RADIO IC – WUXI CHINA, CDGP pdf, CDGP pinout, Other data sheets within the file: CD Pinouts: CDGP datasheet. Description: The CDGP/ Others datasheet of same file: CD,CDGB,CDGP. /01/
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CD2003—AM/FM radio monolithic integrated circuit
The speaker doesn’t connect to the ground in this setup, Very strange. There are 2 resistors connected to the collector of theand there is a biased resistor k connected in between. C16 couples the inverting inputs of the audio amplifiers together for AC signals. Yes you can use a ceramic cap also as long as it is also 10 uF.
All these Caps have one pin to ground, the other to the signal node so they for filtering high frequency noise out of the signal. R6 has probably to do with the volume adjust. Not how R6 is 10 k but the potmeter is 50 k.
TA2003P datasheet, pinout, features and circuit details
Maybe the potmeter is not a logarithmic one like you would normally use for audio. Then a cheap trick to fake a more logarithmic behavior is to load the potmeter with a relatively low resistance, R6 in this case.
It behaves lika a bandpass filter but with much narrower bandwidth than you could easily get from an LC filter. Note how the bottom pin of CF2 is actually connected to the positive supply rail, the other pins are input and output.
CF2 2 pins can be either a crystal or a ceramic resonator. Since it has a ohms resistor in series I conclude it’s a resonator.
CDGP Datasheet PDF – FM/AM RADIO IC – WUXI CHINA
Crystals are more expensive and placing a resistor in series with a crystal deteriorates it’s properties. I think here this resonator is used as a filter for the detector output, cx2003 the CD datasheet. It’s a CE stage Common Emitterpart of the output signal is fed through that k resistor back to the input. This provides local feedback.
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Atmega 2 9 Google doesn’t show any detail information as well. According to the circuit they are connected to Fm Out and Fm In, so it much be some kind of filter. I also found a wiki entry: That Crystal filter consists of many resonators to make a filter. This SAW filter is already a filter by itself in c2d003 component. Note how at CF1 C ermic F ilter it says: SAW filters can be expensive, also we have full on-chip solutions these days so you won’t see many SAW filters in modern products.
CF1 is a ceramic filter rather than a SAW device.
CD – yet another simple FM radio receiver « Dangerous Prototypes
CF2 may be a phase shifter required for the quadrature detector FM demodulator – a kind of ceramic filter but optimised for linear phase across the IF passband. BrianDrummond According to muRata, see: I think it operates in the same way as a SAW filter. Same thing different names. But if I’m wrong please explain the difference as I could not find any. There are similarities but piezoelectric effects are usually bulk rather than surface properties and I think that’s the difference.
The opamp outputs are connected as a ‘bridge’. You can therefore get double the voltage swing on the loudspeaker for the same battery voltage.
ChrisR 4 6.
Correct and there’s also another advantage to a bridge, you don’t need a large output capacitor for the speaker.
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