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Old 2nd June 2018, 02:03 AM   #2681
prasi is offline prasi  India
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Studio Reference Amplifier
very nicely done. congratulations.
regards
Prasi
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Old 4th June 2018, 03:52 AM   #2682
saminnografix is offline saminnografix  Philippines
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Default SR250

to sir mile thank you for this amp. it was tested the result was at first i cannot adjust bias so i replaced resistor in BD139 (B-C) 1K with 1K5. now i have set some bias but DC offset was high at about +/-55mV tested @55VDC
i think the bass was very reach, mid and high are just enough not that loud compared to my "SR200" or "AX14(3pairs)". with the following measurements attached. i hope for some advices...
these measurements was taken with shorted input but with 8r100w at output without resistor or bulb in series...

regards
sam
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File Type: jpg SR250 measurement.jpg (489.3 KB, 508 views)
File Type: jpg sr250.jpg (454.7 KB, 492 views)
File Type: jpg sr250-1.jpg (333.6 KB, 458 views)
File Type: jpg sr250-2.jpg (390.7 KB, 443 views)
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Old 4th June 2018, 06:27 AM   #2683
saminnografix is offline saminnografix  Philippines
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Quote:
Originally Posted by thimios View Post
This circuit isn't a soft start circuit!
It is just a push on push off circuit and uses main voltage for 4011 i. c. Use switch button suitable for main voltage only!!!
These are <<alwayes live circuits>>.
yes it's not i notice it when i redraw that circuit based on available components, but i continued since i have most of parts from salvaged units and the IC was available on local stores not expensive, used it for 300VA traffo
not a soft start thanks for reminding pls see the attached picture of completed work.
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Old 4th June 2018, 09:11 AM   #2684
kandimba is offline kandimba  Portugal
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Hi ! In order to get low DC offset, you should match 2N5551 input pair, with the same HFE.
Quote:
Originally Posted by saminnografix View Post
to sir mile thank you for this amp. it was tested the result was at first i cannot adjust bias so i replaced resistor in BD139 (B-C) 1K with 1K5. now i have set some bias but DC offset was high at about +/-55mV tested @55VDC
i think the bass was very reach, mid and high are just enough not that loud compared to my "SR200" or "AX14(3pairs)". with the following measurements attached. i hope for some advices...
these measurements was taken with shorted input but with 8r100w at output without resistor or bulb in series...

regards
sam
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Old 9th June 2018, 08:31 AM   #2685
thanhsubasa is offline thanhsubasa  Viet Nam
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Hi Mr apex,

My sr200 amp was working nearly 3 year, the sound is excellent.
But yesterday, when I touch 1 side of heatsink was overheat, it's too hot, so i've unplug the power.
Please help me what's happened and how to solve it.

Thanks and regards,
Thanh Tran
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Old 30th June 2018, 08:27 AM   #2686
Yuriy64 is offline Yuriy64  Russian Federation
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Default Question of protection APEX SR150

Quote:
Originally Posted by 44250 View Post
GIF , pdf and sprint-file:
I did not understand how the protection is connected, where to connect the AC-AC terminals, that go to the diodes 1N4007 ?
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Old 30th June 2018, 11:59 AM   #2687
delange is offline delange  Belgium
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Quote:
Originally Posted by thanhsubasa View Post
Hi Mr apex,

My sr200 amp was working nearly 3 year, the sound is excellent.
But yesterday, when I touch 1 side of heatsink was overheat, it's too hot, so i've unplug the power.
Please help me what's happened and how to solve it.

Thanks and regards,
Thanh Tran
If it's still playing okay then I would check the bias value.
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Old 30th June 2018, 04:58 PM   #2688
44250 is offline 44250  Serbia
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Quote:
Originally Posted by Yuriy64 View Post
I did not understand how the protection is connected, where to connect the AC-AC terminals, that go to the diodes 1N4007 ?
AC-AC goes to secondary of main transformer. when there is no secondary voltage, capacitor that comes after two 1n4007 diodes drains fast acting as "fast turn off loudspeaker". 2W resistors in series with relay coil must be calculated depending on relay coil resistance and voltage of transformer secondary. relay must have its defined voltage(better 24Vdc) and on that 2W resistor must be rest of voltage.
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Old 30th June 2018, 05:09 PM   #2689
Yuriy64 is offline Yuriy64  Russian Federation
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Thanks 44250, I'll try to do as you wrote
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Old 30th June 2018, 10:06 PM   #2690
44250 is offline 44250  Serbia
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it takes a bit of calculating and real life measurements but 8n reality it works. so,you should make some calculations (current through relay related to voltage after capacitor wich is after 1n4007 diodes),ant to have a bit more capacitors of close enough capacity (+/-30% of capacity in schematic) and also a batch of 2W close enough to calculation value resistors. immediately it looks like a long stretch, but when you do he math and practice, and when it works as it should (you have a right voltage at relay contacts),it works all the way around, all the time! for a few years now...
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