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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Tweakers’ Asylum

However the reverb on 027d amp does function quite well so I’m still scratching my head 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. Ziddik Member Oct 15, Link of the circuit http: Nikolai Petrenko Member Oct 8, Satellite speakers drive by 1 LA Started by fastline Yesterday at 8: Your name or email address: They are near as damn it the same thing.

Question Posted by crash in forum: Thread starter Nikolai Petrenko Start date Oct 8, To participate you need to register.

A Randall RH G2 to be exact. December Automotive Industry Roundup: Forums New posts Search forums. No, create an account now. Media New media New comments Search media. I put the old one back in and unplugged the reverb tank and the problem went away. You May Also Like: In sound quality that is.


Electro Tech is an online community with overmembers who 02d talking about and building electronic circuits, projects and gadgets.

First I tried a used one I had laying around and the 2nd gain stage would not function at all Based on the datasheets they are extremely similar with the exception of the slew rate. I’m guessing the way the circuit was designed that the CP would not function properly. What is wrong about active filter??? When i connect the filter to the TDA boardsubwoofer hum too loud and some sound like “ugg” or “ups”. You must log jc or register to reply here.

4x Dual J-fet OPAMP IC Njm072d JRC Op-amp Njm072 072d

Either 2 bad chips or not meant to work on that application. You must have a wiring or shielding problem if there is noise that is reduced when you touch its ground. But I concern to reduce noise. I am making a low power home theater amplifier.

I only use one of its channels.


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I used 2 Tda to drive subwoofer speaker. But the problem in the subwoofer amplifier. Design formula are pretty easy in attached. Either way I have since discovered that the chip is not the real problem anyway. Click here to register now. For an accurate crossover the satellite amplifiers need 072dd highpass filter that matches the lowpass filter for the subwoofer.

By continuing to use this site, you are consenting to our use of cookies. The digital modem for my cable internet causes a clicking noise in my nearby stereo and in my wireless telephone. Aug 13, 55 0. Problem of subwoofer amplifier.

Dec 28, 2. Quote of the day. Nikolai Petrenko Member Oct 19, Then I installed a brand new CP and has the exact same results.

New Japan Radio says on its datasheet for the NJM that in certain applications like a follower low gain it may oscillate.

A TL or TL is very common and is available everywhere except not on the moon, are you there?