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4x Dual J-fet OPAMP IC Njmd JRC Op-amp Njm d. Be the first to write a review. About this product. Picture 1 of 3; Picture 2 of 3; Picture 3 of 3. Hey I’ve got an old keyboard amp lying around, and It’s got four 8-pin IC’s in it, labelled D JRC Anybody have any idea on what these. EPCOS AG. Part No. CXOD-FREQ-OUT3. Description, CRYSTAL OSCILLATOR, CLOCK, MHz – MHz, TTL OUTPUT. File Size, K / 1 Page.

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For a better experience, please enable JavaScript in your browser before proceeding. Problem of subwoofer amplifier. Thread starter Nikolai Petrenko Start date Oct 8, Nikolai Petrenko Member Oct 8, I am making a low power home theater amplifier. Satellite speakers drive jec 1 LA But the problem in the subwoofer amplifier. I used 2 Tda to drive subwoofer speaker.

Problem of subwoofer amplifier

I also built a low-pass filter is active. Filter circuit from construyasuvideorockola.

When i connect the filter to the TDA boardsubwoofer hum too loud and some sound like “ugg” or “ups”. I’m trying to use passive filtersnoise and “ugg” no more. What is wrong about active filter??? Constryasu using TL circuitjr say can replace by uA But when I buy componentsI forget it.


I only use one of its channels. Link of the circuit http: A TL or TL is very common and is available everywhere except not on the moon, are you there?

( 4 pcs/lot ) Dual J-FET OpAmp IC NJM072D, JRC OP-AMP NJM072 072D.

The datasheet says that at low gain it will probably oscillate. Nikolai Petrenko Member Oct 11, New Japan Radio says on its datasheet for the NJM that in certain applications like a follower low gain it may oscillate.

The 0772d from Texas Instruments and copied by many English speaking companies never oscillates because it has proper frequency compensation. The “improved” by Toshiba oscillated so badly that all that were sold were recalled and replaced with something else.

jrc d cdm datasheet & applicatoin notes – Datasheet Archive

I think the New Japan Radio opamp uses Toshiba’s design. Nikolai Petrenko Member Oct 15, I use 1K resistor and 1uF, and and variable resistor to control cutoff frequency point, but the variable seem be not effect.

Or many other types also. Ziddik Member Oct 15, You will need dual power supply. For a 2nd-order rolloff you can use a Sallen-Key filter with a dual-pot to vary the rolloff frequency such as shown here.

Digital potentiometers are shown but a dual-ganged manual pot will also work. For an accurate crossover the satellite amplifiers need a highpass filter that matches the lowpass filter for the subwoofer. You can certainly use the NJM parts. Design formula are pretty easy in attached. Nikolai Petrenko Member Oct 19, But I concern to reduce noise. What shuld I do??? When I touch the ground, noise on satellite reduce, but not in subwoofer.


Now you say there is noise but you did not describe the noise. Low frequency hum from the 50Hz or 60Hz electricityhigh frequency hiss or radio interference?? You must have a wiring or shielding problem if there is noise that is reduced when you touch its ground. The digital modem for my cable internet causes a clicking noise in my nearby stereo and in my wireless telephone. You must log in or register to reply here.

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