Vaccum tube Equalizer schematic? - Page 4

kissabout2002 · 24th November 2020, 08:57 AM

The Blonder-Tongue Audio Baton replica on the way, I just finished one channel and test it.

I stick to the original schematic but I add a 5 led bar graph, led VU meter and an unusual power supply that works very well.

The second channel will be upside down for fit inside a 3U cabinet and when finish will looks as the picture of the front panel. Both channel will be completely independent.

Sound is excellent just some minor noise issue but I will work out on it, this is just the first test.

All the best to everybody.

kodabmx · 24th November 2020, 12:01 PM

That little boost module might be your source of noise. I have found them to be terrible, quite frankly.

I would recommend trying one of these instead if you do determine it's coming from the boost module.

DC-AC Converter 12V to 110V 200V 220V 280V 150W Inverter Boost Board Transformer | eBay

Awesome project man.
Koda

kissabout2002 · 24th November 2020, 12:33 PM

Hi Koda thank you very much for the tips, on the first test was very terrible then I add a resistor and 100uf cap and the bad noise goes away, the remaining noise is very small and I think is because all the potentiometer are not grounded yet, but I want for sure try the inverter boost you suggested, I know you have a big experience on it....thanks again

kodabmx · 24th November 2020, 12:39 PM

You're welcome. Since you're in the Philippines, you can probably find another seller that offers them for like 1/2 the price. Look around on eBay and Ali.
One nice thing about the one I linked is it's push pull instead of SE, and it's isolated. I use them for negative supplies for bias, too

kissabout2002 · 24th November 2020, 12:44 PM

I already find it https://shopee.ph/SUNYIMA-DC-AC-Conv...930.5163547118 thanks

kissabout2002 · 8th December 2020, 03:15 AM

Quote:

Originally Posted by kodabmx

That little boost module might be your source of noise. I have found them to be terrible, quite frankly.

I would recommend trying one of these instead if you do determine it's coming from the boost module.

DC-AC Converter 12V to 110V 200V 220V 280V 150W Inverter Boost Board Transformer | eBay

Awesome project man.
Koda

I received yesterday and test it and all noise gone, this is really a good product, thanks Koda....all the best

kodabmx · 8th December 2020, 03:29 PM

Glad it worked out for you!

dgta · 8th December 2020, 04:28 PM

Koda, is that boost module regulated or ratiometric? I.e. if you feed it higher than 12V will it output a proportionally higher voltage? Thx

kodabmx · 8th December 2020, 04:52 PM

It's ratiometric. If you run it from a regulated 12V supply it's as good as regulated though.

24th November 2020, 12:01 PM	#32
kodabmx Spreading triode love. diyAudio Member Join Date: Oct 2011 Location: Toronto	That little boost module might be your source of noise. I have found them to be terrible, quite frankly. I would recommend trying one of these instead if you do determine it's coming from the boost module. DC-AC Converter 12V to 110V 200V 220V 280V 150W Inverter Boost Board Transformer \| eBay Awesome project man. Koda __________________ If you can't learn to do something well, learn how to enjoy doing it poorly.

24th November 2020, 12:39 PM	#34
kodabmx Spreading triode love. diyAudio Member Join Date: Oct 2011 Location: Toronto	You're welcome. Since you're in the Philippines, you can probably find another seller that offers them for like 1/2 the price. Look around on eBay and Ali. One nice thing about the one I linked is it's push pull instead of SE, and it's isolated. I use them for negative supplies for bias, too __________________ If you can't learn to do something well, learn how to enjoy doing it poorly.

8th December 2020, 03:29 PM	#37
kodabmx Spreading triode love. diyAudio Member Join Date: Oct 2011 Location: Toronto	Glad it worked out for you! __________________ If you can't learn to do something well, learn how to enjoy doing it poorly.

8th December 2020, 04:52 PM	#39
kodabmx Spreading triode love. diyAudio Member Join Date: Oct 2011 Location: Toronto	It's ratiometric. If you run it from a regulated 12V supply it's as good as regulated though. __________________ If you can't learn to do something well, learn how to enjoy doing it poorly.

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24th November 2020, 12:33 PM	#33
kissabout2002 diyAudio Member Join Date: Sep 2018 Location: Philippines	Hi Koda thank you very much for the tips, on the first test was very terrible then I add a resistor and 100uf cap and the bad noise goes away, the remaining noise is very small and I think is because all the potentiometer are not grounded yet, but I want for sure try the inverter boost you suggested, I know you have a big experience on it....thanks again

24th November 2020, 12:44 PM	#35
kissabout2002 diyAudio Member Join Date: Sep 2018 Location: Philippines	I already find it https://shopee.ph/SUNYIMA-DC-AC-Conv...930.5163547118 thanks

8th December 2020, 04:28 PM	#38
dgta diyAudio Member Join Date: May 2011	Koda, is that boost module regulated or ratiometric? I.e. if you feed it higher than 12V will it output a proportionally higher voltage? Thx

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