Susumu RR series = thin film, cheap and cheerful 😀
https://www.digikey.com/en/products/detail/susumu/RR0510P-102-D/432398
https://www.susumu.co.jp/usa/product/category.php?cid=5
https://www.digikey.com/en/products/detail/susumu/RR0510P-102-D/432398
https://www.susumu.co.jp/usa/product/category.php?cid=5
I used those RR in Viktor’s oscillator and melf in Sam’s ultra low noise preamp but that’s for precision instrumentation.
Take Nelson Pass’s advise, this is audio used for pleasure it’s not dialysis.
Take Nelson Pass’s advise, this is audio used for pleasure it’s not dialysis.
I checked out JW's "Yageo" thin films - https://www.mouser.com/datasheet/2/447/PYu_RT_1_to_0_01_RoHS_L_12-3003070.pdf.
Better made and .10C cheap. I'll replace all in the BOM with them.
Also in the BOM , I'll add 390/470/560 values for R14/21. These values are what I had to simulate with for
3 different chinese red led models. My real world china 3mm led (1.89 Vf) needed the 470R , which gave 3.3ma on a 12V CCS.
Just .40C for 4 extra 0805's.
OS
Better made and .10C cheap. I'll replace all in the BOM with them.
Also in the BOM , I'll add 390/470/560 values for R14/21. These values are what I had to simulate with for
3 different chinese red led models. My real world china 3mm led (1.89 Vf) needed the 470R , which gave 3.3ma on a 12V CCS.
Just .40C for 4 extra 0805's.
OS
OK, "spookyamp.zip" is complete with BOM.
Next is the "mini" OPS. Familiar standard parts here...
OS
Next is the "mini" OPS. Familiar standard parts here...
OS
Patience , I'm taking my time to make sure of best parts and exact spacing's.
OK , Hell it will be .... I almost have the Mini done.
Yes , Hellraiser will be the "mini" stereo pair to run my Mission 8" 2 ways. It's a "masterpiece".
I'm choosing - TOSHIBA !! -
https://www.mouser.com/ProductDetail/Toshiba/HN1B01F-GRTE85LF?qs=iCzJi/IZBF6L5tumBXghYQ==
But even as the pinout is the same EBC , the P/N is reversed from the BCxxx (my original choice). Layout is correct if
you reverse the chip , that's all. I might flip the screen printing on the Gerber ... so there is NO mistake.
OS
OK , Hell it will be .... I almost have the Mini done.
Yes , Hellraiser will be the "mini" stereo pair to run my Mission 8" 2 ways. It's a "masterpiece".
I'm choosing - TOSHIBA !! -
https://www.mouser.com/ProductDetail/Toshiba/HN1B01F-GRTE85LF?qs=iCzJi/IZBF6L5tumBXghYQ==
But even as the pinout is the same EBC , the P/N is reversed from the BCxxx (my original choice). Layout is correct if
you reverse the chip , that's all. I might flip the screen printing on the Gerber ... so there is NO mistake.
OS
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Consensis says its better to mount the o/p bjts closer to the bottom of the heatsink. Do you due diligence and find out for yourself.
Also looks ugly and questionable with bjt's mounted on in different positions on left and right side heatsinks.
Good luck folks,
FYI, for smt I use this solder, enough for a lifetime.
738-13368
Also looks ugly and questionable with bjt's mounted on in different positions on left and right side heatsinks.
Good luck folks,
FYI, for smt I use this solder, enough for a lifetime.
738-13368
I could make separate L/R OPS boards. Luck ? No luck involved here - 100's of Wolverines are fine.
"Mini" can be at right angle to the HS. IPS's can then be right angled to the OPS. 3 different mounting options.
Builder (below) measured just about 1C (difference) with a "flipped" around L/R. Total Dissipation is the same but I bet the
bottom O/P's are the ones 1C cooler. "Consensuses" are typically subjective.
OS
"Mini" can be at right angle to the HS. IPS's can then be right angled to the OPS. 3 different mounting options.
Builder (below) measured just about 1C (difference) with a "flipped" around L/R. Total Dissipation is the same but I bet the
bottom O/P's are the ones 1C cooler. "Consensuses" are typically subjective.
OS
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Please Pete,look at the bom that you have posted
I think that you have some errors.
Q3,Q4 can't be 55xx,i see dual package there
I think that you have some errors.
Q3,Q4 can't be 55xx,i see dual package there
It could be confusing ? Regular 5551 is single , but FMBM5551 is a dual - https://www.mouser.com/ProductDetail/onsemi-Fairchild/FMBM5551?qs=VOMQJJE%2BBNnHm/5A44uOUQ== .
Q9,10 is the PNP - the FMBM5401 dual.
OS
Q9,10 is the PNP - the FMBM5401 dual.
OS
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Hellraiser in red , as it should be ! If you use that Toshiba dual on your Hellraiser , note the P-N designation
on diamond buffer Q4-5. BCxxx dual is correct , Toshiba dual is reverse P-N. Toshiba is the better dual , I will use it
in the BOM and reverse the screen print around. Layout is correct either way.
PS - on the spooky (Q5-6,Q7-8) , the Toshiba's are a perfect match. On either you can use the BCxxx duals ,as well.
OS
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I did notice I forgot the servo op-amp on the spooky BOM , me bad !
SO-8 LF353 or TL062 (any SO-8 dual). TL062 only uses .3mA per rail no load. Just $1.25.
Yeah ! 10mA hellraiser consumption and 12mA spooky current draw per rail. Ice cold IPS's.
OS
SO-8 LF353 or TL062 (any SO-8 dual). TL062 only uses .3mA per rail no load. Just $1.25.
Yeah ! 10mA hellraiser consumption and 12mA spooky current draw per rail. Ice cold IPS's.
OS
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Thanks. I'll streamline it .... Q1,Q12,Q16 = FJV1845 and Q2,Q11,Q13 = FJV992.
That will make the BOM even easier. All are "F" ranked 300-600Hfe.
Neat they still have our favorite 1845/992 pair in SMT !
OS
That will make the BOM even easier. All are "F" ranked 300-600Hfe.
Neat they still have our favorite 1845/992 pair in SMT !
OS
I was wondering if anyone looked into these dual SMD transistors - MBT6429 by onsemi ???
hfe rated for those is 500 to 1250
This is NPN type
I could not find PNP complimentary unfortunately
hfe rated for those is 500 to 1250
This is NPN type
I could not find PNP complimentary unfortunately
I saw those. As far as low voltage duals , we have about 6 that have P/N compliments . Of those only 3 that are the larger package (SOT-6).
High voltage duals are rarer , many having common emitters or collectors with 5 pin (SOT-5). The only reason I used
HV duals on spooky was to save space. Hellraiser has almost all singles (SOT-23). The one dual I did use was to have closer specs and
thermal matching for the diamond buffer.
In this new world , catering to HV class AB semi's is not a priority. Plenty (100's) of LV switching semi's used for class D/SMPS gate drivers.
PS - 6429 is a 700mhz with 1K gain - definitely digital.
OS