Removing power supplies to external chassis just replaces one set of problems with another set of problems.
This thing is really low power anyways, and the layout is nicely done.
-Josh
Sorry, I glitched on the date! (Jan 2019)
Hi Joshua
I had the same problem, and "the forum" gave me this recommendation:
https://www.diyaudio.com/forums/pass-labs/181552-b1-preamp-build-thread-61.html#post5937294
I went that way, but still haven't built mine yet. (Matter of days)
david
Hi Joshua
I had the same problem, and "the forum" gave me this recommendation:
https://www.diyaudio.com/forums/pass-labs/181552-b1-preamp-build-thread-61.html#post5937294
I went that way, but still haven't built mine yet. (Matter of days)
david
Newark has the 20k alps pot although they are not motorized.
https://www.newark.com/alps/strk27102/potentiometer-20k/dp/01M8616
https://www.newark.com/alps/strk27102/potentiometer-20k/dp/01M8616
Signal area Resistors
sorry to bother you again.
I just started populating/boarding the PCB, it's the ten years after.
I just realize that on the PCB the resistors are stated "220 / 220K" while the BOM says "221 /221K". (If it's the correct position)
Wrong place or not a problem?
Thank you!
david
sorry to bother you again.
I just started populating/boarding the PCB, it's the ten years after.
I just realize that on the PCB the resistors are stated "220 / 220K" while the BOM says "221 /221K". (If it's the correct position)
Wrong place or not a problem?
Thank you!
david
Same thing. Its the specific listed type wasn't exactly available at 220 Ohm and 220k so 221 Ohm and 221k was chosen.
Yes, but not by modifying a Mezmerize, they had made double Hypnotize boards to handle each phase. Hypnotize was a single input beefed up DCB1 board.
Any leads on finding two DCB1 boards? After some searching, it seems they are not being manufactured. Any other suggestions for circuits with PCBs that are available?
Is the DCB1 just “directed coupled B1”? So the Mesmerize B1 PCB from the store will work as the PCB?
Question to start the work
Hi, I am am Italian diyer, in my career I assembled 2 speakers and some power amp. Now I am running a My-Ref C power amp with an old venerable AM-AUDIO preamp. I would like to smell some solder wire again and I was planning to assemble a Mesmerize. I am not an electronic guru, honestly my mechanical training does not help me very much with 'schematics' and DC OFFSET stuff.
I have the idea to put the mesmerize in the same box with an headphone amp board. The two boards will have their own PSU (clearly one AC socket for both) and I would like to use the mesmerize input selector to obtain a single audio source.
I am not sure about the idea of sharing the input between the mesmerize and the headphone amp. I thought about using an ELMA switch to direct the input to the mesmerize amp section or alternatively to the headphone amp. The best would be also to use one single volume knob, so I guess I should intercept the signal at the ALPS potentiometer output, direct it to an ELMA switch and from there back to each board.
Question: does it make any sense? I would like to think that there is some better solution out there.
Another question: which kind o thermal fuse I should take for the main AC input?
Many thanks and great design indeed
Gli
Hi, I am am Italian diyer, in my career I assembled 2 speakers and some power amp. Now I am running a My-Ref C power amp with an old venerable AM-AUDIO preamp. I would like to smell some solder wire again and I was planning to assemble a Mesmerize. I am not an electronic guru, honestly my mechanical training does not help me very much with 'schematics' and DC OFFSET stuff.
I have the idea to put the mesmerize in the same box with an headphone amp board. The two boards will have their own PSU (clearly one AC socket for both) and I would like to use the mesmerize input selector to obtain a single audio source.
I am not sure about the idea of sharing the input between the mesmerize and the headphone amp. I thought about using an ELMA switch to direct the input to the mesmerize amp section or alternatively to the headphone amp. The best would be also to use one single volume knob, so I guess I should intercept the signal at the ALPS potentiometer output, direct it to an ELMA switch and from there back to each board.
Question: does it make any sense? I would like to think that there is some better solution out there.
Another question: which kind o thermal fuse I should take for the main AC input?
Many thanks and great design indeed
Gli
connect 3 power amps to the Mezmerize B1 buffer preamp
Hi all, I am new here. Soon I hope to build the Mezmerize B1 buffer preamp Ten years after.
I have very little experience in this.
I have 2 questions...
The first quesion is..
I plan to connect 3 power amps.
Amp 1 for the Tweeter
Amp 2 for the Mid
Amp 3 for the Bass
Between the preamp and each poweramp there will be a PLLXO.
Can the Mezmerize B1 buffer preamp control these 3 power amps?
The second question is..
I only use a DAC at the input. So I do not use an input selector.
Can I remove or bypass the PCB 12V relays and 1N4007-E3/54 diodes? Or do I keep the diode in place?
Please can anyone help with this?
Hi all, I am new here. Soon I hope to build the Mezmerize B1 buffer preamp Ten years after.
I have very little experience in this.
I have 2 questions...
The first quesion is..
I plan to connect 3 power amps.
Amp 1 for the Tweeter
Amp 2 for the Mid
Amp 3 for the Bass
Between the preamp and each poweramp there will be a PLLXO.
Can the Mezmerize B1 buffer preamp control these 3 power amps?
The second question is..
I only use a DAC at the input. So I do not use an input selector.
Can I remove or bypass the PCB 12V relays and 1N4007-E3/54 diodes? Or do I keep the diode in place?
Please can anyone help with this?
I would like to add some other thoughts to my original message...being mesmerize a buffer with unity gain I probably need to route its output to a couple of connectors directed to my power amp and to a headamp board. I do not know how to do it, simple a parallel between the two output or other better way (a switch or something more exotic?)
@ Gli
Its a good idea to redirect the signal with a switch so to isolate the two circuits.
The Mezmerize 2018-19 notes refer to fuses rating for 50VA own transformer.
https://cdn.shopify.com/s/files/1/1006/5046/files/Mez_TYA_018_BOM_Notes_Rev.pdf?70
Its a good idea to redirect the signal with a switch so to isolate the two circuits.
The Mezmerize 2018-19 notes refer to fuses rating for 50VA own transformer.
https://cdn.shopify.com/s/files/1/1006/5046/files/Mez_TYA_018_BOM_Notes_Rev.pdf?70
You put 100R in line resistors to the head amp board output route. So they isolate the amp from the headamp route somewhat.
Its just capable regarding signal current control for that setup if the interconnects will not be too long. Its current is only a JFET IDSS you see. Very good proven quality buffer but not high current buffer.
If you will not apply the relays you don't need to apply the diodes either. If you will just bypass them so they will still be energized keep the diode. Its fly back diode for suppressing the coil's back EMF transient.
Thanks for the reply Salas!
What do you think is a better option than?
I have a wonderfull horn loudspeker system. These horns do best with seperat amps and specific frequency range. And I don't like actice crossover that much.
Please give me advice