The only time I saw it clip was when pressing the frequency multiplier buttons. AVC works great here too, steady at 7 for all frequencies. Maybe I won't mess with those TL072 chips after all!Īs expected with the terminator removed it goes up to 7Vrms. With the output voltage control all the way up the AVC limits every single frequency to between 3.44Vrms to 3.51Vrms. The good news is the KH4400B's AVC circuit is amazing. I did the tests with the 50R load, then removed it an ran again.
![eevblog clipping detector eevblog clipping detector](https://www.protcap.com.br/images/products/original/57_mc4.jpg)
And my tests recent showed it triggering on around 184uV(rms) at 20Hz from the KH440B and 170uV(rms) or so at 1KHz from a Victor board with a resistive divider on the output.
![eevblog clipping detector eevblog clipping detector](https://www.instrumart.com/assets/BW-clip-360.jpg)
#EEVBLOG CLIPPING DETECTOR FULL#
The marketing literature is full of the statement "see small signal details in the presence of large signals (with the 10 bit ADC)". Noise out of the regulators should be a great test for this new RTB2004 scope. If anybody out there knows any reason why a LM2940CT-15/2990T-15 "LDO" (it really isn't) pair beats a on-seni MC7815/MC7915 pair, other than possibly 1V less dropout, please post! I'm just not seeing it from the datasheets. I pondered upping those to 3300uf or 4700uf for the longest time (mouser has those in the same 16mm diameter 35V), but given those darn 2940/90 LDOs with their minimum *and maximum" load ESR table in the datasheet I figured best go for equivalent. I'll measure the ripple under no-load and load going into the vregs with the old electros, then again with the new. I just got in and didn't get a chance to swap them out yet today. I'm also curious just how bad the old 2200uF are. I'm curious about those measurements too given the possiblity of swapping the regulators. But for the AVC circuit, especially this one using the analog multiplier, all the other stuff (than THD) probably is most important, just as long as the THD is only slightly less.ġaudio - definitely, will do.
#EEVBLOG CLIPPING DETECTOR UPGRADE#
Studied the TLE datasheet a bit through and they upgrade many things, but doesn't look like THD is one of them. I'm tempted to replace the TL074's in that section (the two chips in middle of the board in the section marked "B" in the photos) with TLE2074s, the "upgrade". I'm curious about that test myself in terms of how well the AVC is working to keep the levels steady.
![eevblog clipping detector eevblog clipping detector](https://ecs7.tokopedia.net/img/cache/700/product-1/2019/1/4/1647724/1647724_0983a688-089e-43cc-a818-61aedb18fa02_1560_1560.jpg)
I think the 50R terminations I have are even rated at 2W so they could handle the 7Vrms+, but I think this KH4400B is set up to load down to 3.5Vrms with a matching 50R load.