Just some clarification because people seem to be finding this video: I bought this function generator back in March 2021 from AliExpress. I noticed this problem immediately upon its arrival, and requested a replacement. If anyone has bought from them, you'll know that they require a video proof demonstrating the problem. This was intended to be that video. They sent me a replacement chip (an opamp). Yes, it was a tiny SMD component, and I had a bit of trouble getting it soldered in. But it's fixed now, and I'm almost certainly sure that this was simply a factory defect, and I've had no further trouble with it. It is a really nice and solid function generator for the price. Would definitely recommend.
good to point out... thankfully i'm testing home audio..vintage amps, integrated and power. even receivers. they use an input of between 200 milli and 2v depending on unit. so i'll never need anything above 2 volts. but good to know anyway.
After trying to fix mine - both channels fail above 5v, I spent a lot of time looking online. According to one source, different opamps are switched in via relays for signals above 5v. You can hear the relays click when you turn up to 6v. They are under the heatsink and are labelled 3002I. These chips are also now hard to get hold of. Again using another online source, they are dual opamps and each opamp is connected in parallel with itself. I would love to get a definitive answer on this. Are the 3002 chips faulty or is it something else?
Just some clarification because people seem to be finding this video:
I bought this function generator back in March 2021 from AliExpress. I noticed this problem immediately upon its arrival, and requested a replacement. If anyone has bought from them, you'll know that they require a video proof demonstrating the problem. This was intended to be that video. They sent me a replacement chip (an opamp). Yes, it was a tiny SMD component, and I had a bit of trouble getting it soldered in. But it's fixed now, and I'm almost certainly sure that this was simply a factory defect, and I've had no further trouble with it. It is a really nice and solid function generator for the price. Would definitely recommend.
Could you do a video showing where the replacement goes?
good to point out... thankfully i'm testing home audio..vintage amps, integrated and power. even receivers. they use an input of between 200 milli and 2v depending on unit. so i'll never need anything above 2 volts. but good to know anyway.
After trying to fix mine - both channels fail above 5v, I spent a lot of time looking online. According to one source, different opamps are switched in via relays for signals above 5v. You can hear the relays click when you turn up to 6v. They are under the heatsink and are labelled 3002I. These chips are also now hard to get hold of. Again using another online source, they are dual opamps and each opamp is connected in parallel with itself. I would love to get a definitive answer on this. Are the 3002 chips faulty or is it something else?
Hi, what was the replaced chip? I've the same problem
As hou wrote, one opamp, being the offset Insertion, that's actually done quite early on in the circuit pre final amplification.
Здравствуйте, скиньте пожалуйста дамп прошивки от генератора, заранее спасибо
Vote up, nice video clip, thanks for sharing :)
Mine is badged as Dominty, bought second-hand, exactly the same fault.
O that sucks. Did you get a refund / replacement?
Yeah, they sent me a replacement chip
@@MajorCadence Where did you buy?
@@MajorCadence Did the chip replacement fix it?
@@DennisMathias Good question - no answer...
I guess that's the problem with the signal generator.
Saw the same problem here th-cam.com/video/C5J_fCdOpTs/w-d-xo.html Though in this case it was an overheating problem in the end.