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Medium Aleph 3 8ohm@20w.
Medium Aleph 3 8ohm@20w.
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Old 11th June 2018, 04:21 AM   #51
tonimxp is offline tonimxp  Italy
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From my load tests I obtained the following results:
30w into 8 ohm
45w into 4 ohm
29w into 2 ohm
Can be Q9 current limiter manager that limit the power into 2 ohm?
Can i decrease its base resistor (R29) to 47 Ohm?
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Old 11th June 2018, 06:12 AM   #52
Zen Mod is online now Zen Mod  Serbia
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Medium Aleph 3 8ohm@20w.
if you're reaching twice Iq , be satisfied

though , nothing is preventing you to increase current limiting level (as you proposed) and measure results
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Old 13th June 2018, 12:02 PM   #53
Nag is offline Nag  India
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Ok Thank you for ztx 450. R108 is for dc offset approx 0V and R113 is for increasing bias current. Am I correct ?.
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Old 13th June 2018, 12:22 PM   #54
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Medium Aleph 3 8ohm@20w.
ref. to pdf I posted on previous page , yes
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Old 16th June 2018, 06:48 AM   #55
Nag is offline Nag  India
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Hi All,
The amp is ready but I am facing some strange issue.
1. left channel output voltage is around 23 volts. right channel 70mV. Right channel is working I played some song.
2. Replaced input transistors in left channel after that left channel output voltage is 0.1V and right channel is -23V. left channel working right channel not .

Am I connecting RCA wrong or anything .
outer layer is ground and center pin is signal I am I correct ?
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Old 16th June 2018, 07:46 AM   #56
Zen Mod is online now Zen Mod  Serbia
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you're doing something wrong , if while repairing one channel you broke the other one

post pics of present situation
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Old 16th June 2018, 08:50 AM   #57
Nag is offline Nag  India
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Dear Zen Mod,

Sorry for messy wiring.I am posting my pics here.

Actually I didn't touched left channel After right channel repair problem reversed.
Attached Images
File Type: jpg IMG_20180616_141610_HHT.jpg (102.2 KB, 115 views)
File Type: jpg IMG_20180616_141616_HHT.jpg (126.9 KB, 117 views)
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Old 16th June 2018, 10:20 AM   #58
Nag is offline Nag  India
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somewhere some thing shorting. some times it is working.
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Old 16th June 2018, 10:32 AM   #59
adason is offline adason  United States
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Old 16th June 2018, 11:01 AM   #60
avtech23 is offline avtech23  Australia
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Medium Aleph 3 8ohm@20w.
Check under the board for anything loose or in contact with the board.
Isolate the boards (run one board only at a time) and see if there is cross contact.
Disconnect input sources and outputs and check the voltages on the board.

If it occured after disturbance, check everything you touched. Assume any wire you reconnected is in the wrong place until you satisfy yourself otherwise (prove to yourself with the schematic).

Tidy up the wiring. It will make troubleshooting easier for you - and all us spectators.
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