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Old 10th November 2017, 06:12 AM   #2611
Dragan100 is offline Dragan100  Slovenia
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Quote:
Originally Posted by danielrev View Post
can i use 2sc3503 pair in place of sc4793 pair ?
i have to ask because i have it in stock .

Regards,
Daniel

pair of 3503/1381 are low Cob 2.5pF and suitable for VAS
and pair 4793/1837 with 20pF Cob and 1A capability (look the SOA) is beter for predrivers or drivers
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Old 10th November 2017, 06:44 AM   #2612
danielrev is offline danielrev
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thanks dragan ,will check stock on my supplier.
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Old 15th December 2017, 06:35 AM   #2613
saminnografix is offline saminnografix  Philippines
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Default PSU 75 TO 85

hi, sir with regard to post #2597 what is the use of +HI V Pro marked red
do i need to change any component if i use 63-0-63AC
i would want to have 100V for VAS and +/-85V for OPS
thank you
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Old 16th December 2017, 08:41 AM   #2614
saminnografix is offline saminnografix  Philippines
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Default psu60

Quote:
Originally Posted by apexaudio View Post
PSU60
hi sir,
where/what in the use of +40 Pro for
thanks
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Old 16th December 2017, 08:58 AM   #2615
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by saminnografix View Post
hi sir,
where/what in the use of +40 Pro for
thanks
+40V PRO is for protect suply... no need to be use.
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Old 18th December 2017, 06:40 AM   #2616
saminnografix is offline saminnografix  Philippines
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Default PSU

Quote:
Originally Posted by apexaudio View Post
+40V PRO is for protect suply... no need to be use.
thank you sir
here is the PSU please see if it is correct. i will add the +/-15v on the other side later for 5pair SR.

thanks again
sam
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File Type: jpg APEXaudio Reg Amp PSU 85z.jpg (190.8 KB, 649 views)
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Old 18th December 2017, 03:21 PM   #2617
prasi is offline prasi  India
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Studio Reference Amplifier
Quote:
Originally Posted by saminnografix View Post
thank you sir
here is the PSU please see if it is correct. i will add the +/-15v on the other side later for 5pair SR.

thanks again
sam
why use thin traces?, fill the damn thing with copper where ever you can... copper on the copper clad is free, why waste it? etchant (ferric chloride) isnt free either!

regards
Prasi
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Old 18th December 2017, 06:49 PM   #2618
marielito45 is offline marielito45
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hi ,Sr im trying to make a apex B500 but I need the layout of the pcb can you help me ? please and keep doing what you doing good job mile thankyou
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Old 18th December 2017, 10:56 PM   #2619
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by marielito45 View Post
hi ,Sr im trying to make a apex B500 but I need the layout of the pcb can you help me ? please and keep doing what you doing good job mile thankyou
Go to 500W PA amplifier with Limiter
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Old 18th December 2017, 11:37 PM   #2620
saminnografix is offline saminnografix  Philippines
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Quote:
Originally Posted by saminnografix View Post
thank you sir
here is the PSU please see if it is correct. i will add the +/-15v on the other side later for 5pair SR.

thanks again
sam
thanks for noticing but i have drawn it in one stroke only, i intend not to fill it to aid checking i'm not an engr. like most of the people here--just a hobbyist, on final i will just give 2-3 mm distances (to minimize loop - as some diyers often advise).

regards
sam
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