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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Since it has a ohms resistor in series I conclude it’s a resonator. Some reported it to have better reception than TEA I also found a wiki entry: Maybe the potmeter is not a logarithmic one like you would normally use for audio.

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Correct and there’s also another advantage to a bridge, you don’t need a large output capacitor for the speaker. Note how the bottom pin of CF2 is actually connected to the positive supply rail, the other pins are input and output. It reduces the gain of that stage but improves linearity and bandwidth.

Funny thing is it has TEAcompatibility mode. Crystals are more expensive and placing a resistor in series with a crystal deteriorates it’s properties. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policycs2003 that your continued use of the website is subject to these policies. The speaker doesn’t connect to the ground in this setup, Very strange.

R6 has probably to do with the volume adjust. The Op-amp is a dual op-amp, but the output is only mono. Atmega 2 9 CF2 2 pins can be either a crystal or a ceramic resonator. I am working on a simple FM radio receiver. This dtasheet local feedback.


The opamp outputs are connected as a ‘bridge’. You can therefore get double the voltage swing on the loudspeaker for the same battery voltage. You can also subscribe without commenting.

TA2003P datasheet, pinout, features and circuit details

According to the above-mentioned signal flow ,it’s convenient to repair AM or FM radio with sound or radio trouble. It’s a CE stage Common Emitterpart of the output signal is fed through that k resistor back to the input.

There are similarities but piezoelectric effects are usually bulk rather than surface properties and I think that’s the difference. Code is shared on Github: C16 couples the inverting inputs of the audio amplifiers together for AC signals.

Table 1 CD integrated circuit pin functions and typical operating parameters Table 2 CD integrated circuit pin functions and test data on the desheng multi-band radio 3. Sign up using Facebook. The signals received from Antenna input from the CD 16 pin ,mixing with the LO signal in the mixing circuit.

Strange op-amp circuit FM radio – Electrical Engineering Stack Exchange

I think here this resonator is used as a filter for the detector output, see the CD datasheet. Figure 1 CD integrated circuit within the circuit block diagram and typical application circuit2. January 8, at 4: May 20, at According to the circuit they are connected to Fm Out and Fm In, so it much be some kind of filter. May 19, at 6: Home Questions Tags Users Unanswered.

Notify me of followup comments via e-mail. Exactly the same way as when using feedback cd2030 an opamp. But if I’m wrong please explain the difference as I could not find any. CF1 is a ceramic filter rather than a SAW device. Thanks for the information, hopefully it helps to motivate me to get it started. In last few days we are looking for some simple FM radio receiver to integrate into one of our ongoing project.


All files are avaialble at elect. Super cheap from numerous sellers on eBay and microprocessor controllable to boot!

Strange op-amp circuit FM radio Ask Question. Note how at CF1 C ermic F ilter it says: It behaves lika a cd20033 filter but with much narrower bandwidth than you could easily get from an LC filter.

CD – yet another simple FM radio receiver « Dangerous Prototypes

May 19, at 7: 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. After being converted by the IF amplification, detection, electronic switch, the signals output from 11 pin to reach the post-stage circuit. Built the circuit and it works very well. Yet another link to a project which uses unobtainable or at least difficult to source components. One more nicely done radio with TEA Sign up or log in Sign up using Google.

I think it operates in the same way as a SAW filter. The caps cause a degree phase change in the inputs, and the outputs are therefore degrees out of phase as well.