Gathering parts for possible H2O cooled BB
I almost forgot that I had all of this lying around in my parts bin from a couple of years ago. All cobbled together for peanuts from Aliexpress. IIRC, cooler blocks were $5ea, reservoir $7, pump $4, heat-x w fan $13. All 12vdc stuff no PWM or anything. Will need to probably get more cooler blocks. I wonder if this 5in x 5in water-to-air heat X has enough capacity? This is where JPS64's heat monitor and auto-shutdown safety signal circuitry will be really helpful. Hugh has a great story about one of his water cooled Class A amps (that did not have safety auto-shutdown) from a while back...
Although, I have to say I really like how well the heatpipe CPU coolers with a fan work. Super reliable.
I almost forgot that I had all of this lying around in my parts bin from a couple of years ago. All cobbled together for peanuts from Aliexpress. IIRC, cooler blocks were $5ea, reservoir $7, pump $4, heat-x w fan $13. All 12vdc stuff no PWM or anything. Will need to probably get more cooler blocks. I wonder if this 5in x 5in water-to-air heat X has enough capacity? This is where JPS64's heat monitor and auto-shutdown safety signal circuitry will be really helpful. Hugh has a great story about one of his water cooled Class A amps (that did not have safety auto-shutdown) from a while back...
Although, I have to say I really like how well the heatpipe CPU coolers with a fan work. Super reliable.
Attachments
Last edited:
Beautiful work Juntuin! Reminds me of a high end sports car grille.
Are those aluminum channel frames now and not welded steel?
You might want to look into Bosch-Rexroth structural channels. They provide drawings and cut to length and angles for free as value-added service here in US.
Makes great frames for lab setups, assembly lines etc.
Are those aluminum channel frames now and not welded steel?
You might want to look into Bosch-Rexroth structural channels. They provide drawings and cut to length and angles for free as value-added service here in US.
Makes great frames for lab setups, assembly lines etc.
@Juntuin likes BOSCH profiles. Really sexy design, congratulation!
I´ve still F6 power supplies.
µC board progress:
- onboard 20W AC/DC converter Meanwell IMR-20-12
- DC blocking
- CL60 inrush current limiter
- for 115VAC or 230VAC
- RC (1µ/MP3 + 4R7/2512/2W) snubber over relay power contacts
- programming MONO, L/R, WATER
- first checking FAN before main power (115/230VAC) switching
To do:
- mosfets RC snubber G to D on BB (220p + 47R)
JP
I´ve still F6 power supplies.
µC board progress:
- onboard 20W AC/DC converter Meanwell IMR-20-12
- DC blocking
- CL60 inrush current limiter
- for 115VAC or 230VAC
- RC (1µ/MP3 + 4R7/2512/2W) snubber over relay power contacts
- programming MONO, L/R, WATER
- first checking FAN before main power (115/230VAC) switching
To do:
- mosfets RC snubber G to D on BB (220p + 47R)
JP
Attachments
Hi jwjarch,
I sorted out my error with the Juma E-P capMx and am back up and running. I’ll post that in the Juma E-P thread.
I’m using an Antek AS-4220 transformer with the CapMx board built to the schematic specs. When both channels of the ALPHA are connected the capMx outputs 19.1volts
I didn’t think the voltage drop would be 9v when loaded. I thought I’d be hitting 23-24vdc. Maybe I should have went for a trafo with 22v or 24v secondaries.Regards
Attachments
Hi jwjarch,
I sorted out my error with the Juma E-P capMx and am back up and running. I’ll post that in the Juma E-P thread.
I’m using an Antek AS-4220 transformer with the CapMx board built to the schematic specs. When both channels of the ALPHA are connected the capMx outputs 19.1volts
Regards
Glad you sorted out the problem! That voltage drop sounds bad and makes me worried too..
Edit: capmx needs that much sink and cooling??
Yes, it gets hot!!
Now, I am testing with 4ohm speakers, so I don’t know if that’s making my setup more extreme.
On a positive note, there is absolutely ZERO noise emitting from the speakers when no music is playing. I have both grounds from the Alpha boards tied together and connected to the CapMx on a single ground tab.
Question about BigBoy; will 2x30v trafos be too much for BB to handle? I have spare pair of those, 545Va. Theres also an option to unwind some windings if that's necessary..
Well, these news gives another headache
Well, these news gives another headache
Originally Posted by irribeo View Post
Antek datasheet for 18V and 20V 400va show same voltages, funny guys.
AS 4220= AS 4218 = 18V transformer.
Must be a mistake on the spec sheet.
I’ve used over a dozen Antek transformers and they all measured slightly more than tag specs.
The secondaries of this AS-4220 measure 20.33v
Regards
Antek datasheet for 18V and 20V 400va show same voltages, funny guys.
AS 4220= AS 4218 = 18V transformer.
Must be a mistake on the spec sheet.
I’ve used over a dozen Antek transformers and they all measured slightly more than tag specs.
The secondaries of this AS-4220 measure 20.33v
Regards