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Author Topic: SMG 300 WATTS SCHEMATIC  (Read 11856 times)

Offline tony

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Re: SMG 300 WATTS SCHEMATIC
« Reply #120 on: September 15, 2011, 04:36:14 PM »
^L1 can be any value from 2 to 10uH......it's reason for being is to isolate the output stage from the effects of capacitive loading caused by cross-over networks and speaker becoming capacitive at some frequency....

on a 10ohm 2 watt resistor, wind as many turns as you can using a gage 18 or 20 magnet wire, exact numbers are pointless....wire the coil in parallel with the resistor...
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Re: SMG 300 WATTS SCHEMATIC
« Reply #120 on: September 15, 2011, 04:36:14 PM »

Offline kirk simone

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Re: SMG 300 WATTS SCHEMATIC
« Reply #121 on: September 16, 2011, 09:15:46 PM »
paano po ba i adjust yung trimpot baguhan lang po ako.... tanx
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Re: SMG 300 WATTS SCHEMATIC
« Reply #121 on: September 16, 2011, 09:15:46 PM »

Offline tony

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Re: SMG 300 WATTS SCHEMATIC
« Reply #122 on: September 17, 2011, 06:50:44 AM »
bias adjustment? set mo muna sa maximum resistance, then yung emmiter resistor na say 0.22ohms monitor mo voltage, a bias of 50mA will show a voltage drop of 11millivolts, do this ajustment when the heatsink is warm to the touch...back down when the bias is increasing with time....
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Re: SMG 300 WATTS SCHEMATIC
« Reply #122 on: September 17, 2011, 06:50:44 AM »

Offline lhong2x

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Re: SMG 300 WATTS SCHEMATIC
« Reply #123 on: September 23, 2011, 12:37:02 PM »
anu ung max value ng trim pot? im looking kasi sa higher power ng amp na to...
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Re: SMG 300 WATTS SCHEMATIC
« Reply #123 on: September 23, 2011, 12:37:02 PM »

Offline tony

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Re: SMG 300 WATTS SCHEMATIC
« Reply #124 on: September 23, 2011, 01:17:39 PM »
1k to 5k...
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Re: SMG 300 WATTS SCHEMATIC
« Reply #124 on: September 23, 2011, 01:17:39 PM »

Offline lhong2x

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Re: SMG 300 WATTS SCHEMATIC
« Reply #125 on: September 25, 2011, 03:40:01 PM »
Quote from: tony on September 23, 2011, 01:17:39 PM
1k to 5k...


within this value sis, di pa masisira ang mga trannies ko???
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Offline tony

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Re: SMG 300 WATTS SCHEMATIC
« Reply #126 on: September 25, 2011, 04:32:50 PM »
Quote from: lhong2x on September 25, 2011, 03:40:01 PM

within this value sis, di pa masisira ang mga trannies ko???


hindi naman yung trimmer ang nakakasira ng trannies, yung overbiasing at overheating ang nakakasira....
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Offline lhong2x

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Re: SMG 300 WATTS SCHEMATIC
« Reply #127 on: September 30, 2011, 10:30:03 PM »
Quote from: tony on September 25, 2011, 04:32:50 PM
hindi naman yung trimmer ang nakakasira ng trannies, yung overbiasing at overheating ang nakakasira....



i mean sis within that specific value... di ba basta nasisira ang mga trannies???
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Offline Mayalin22

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Re: SMG 300 WATTS SCHEMATIC
« Reply #128 on: September 30, 2011, 11:05:16 PM »
^hindi  ;D
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Offline kirk simone

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Re: SMG 300 WATTS SCHEMATIC
« Reply #129 on: October 27, 2011, 10:03:49 AM »
Quote from: tony on September 17, 2011, 06:50:44 AM
bias adjustment? set mo muna sa maximum resistance, then yung emmiter resistor na say 0.22ohms monitor mo voltage, a bias of 50mA will show a voltage drop of 11millivolts, do this ajustment when the heatsink is warm to the touch...back down when the bias is increasing with time....
so sir tony iibig mo sabihin na ang emmiter voltage is to beset at 11mv to gnd sorry ha if nakairita yung tanong pro gusto ko lang matoto ng baising kasi hangang ic amp lang ako
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Offline tony

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Re: SMG 300 WATTS SCHEMATIC
« Reply #130 on: October 27, 2011, 12:21:58 PM »
Quote from: kirk simone on October 27, 2011, 10:03:49 AM
so sir tony iibig mo sabihin na ang emmiter voltage is to beset at 11mv to gnd sorry ha if nakairita yung tanong pro gusto ko lang matoto ng baising kasi hangang ic amp lang ako

across the 0.22ohm resistor...
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Offline edtechph

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Re: SMG 300 WATTS SCHEMATIC
« Reply #131 on: October 27, 2011, 06:40:57 PM »
yung sa smg sir na diode anu value nun?
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Offline tony

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Re: SMG 300 WATTS SCHEMATIC
« Reply #132 on: October 27, 2011, 07:20:29 PM »
alin doon?
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Offline edtechph

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Re: SMG 300 WATTS SCHEMATIC
« Reply #133 on: October 27, 2011, 07:37:21 PM »
yung sa baba ng r10, meron kasi kami dito smg we ill try to copy it, and san sir available yung j49 and k134 ala dito sa amin
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Offline THXneo

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Re: SMG 300 WATTS SCHEMATIC
« Reply #134 on: October 27, 2011, 08:18:32 PM »
Quote from: edtechph on October 27, 2011, 07:37:21 PM
yung sa baba ng r10, meron kasi kami dito smg we ill try to copy it, and san sir available yung j49 and k134 ala dito sa amin

signal diode yan 1N4148 pang bias,obsolete na yata yung j49 at k134, ang pinalit jan ay j162 at k1058 na.
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Offline edtechph

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Re: SMG 300 WATTS SCHEMATIC
« Reply #135 on: October 27, 2011, 08:24:09 PM »
yellow sir yung band nya, kasi may existing pa dito na smg tinest ko kanina sira isang channel. pwede ko palitan yun nung j162 at k1058?
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Offline THXneo

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Re: SMG 300 WATTS SCHEMATIC
« Reply #136 on: October 27, 2011, 08:27:14 PM »
Quote from: edtechph on October 27, 2011, 08:24:09 PM
yellow sir yung band nya, kasi may existing pa dito na smg tinest ko kanina sira isang channel. pwede ko palitan yun nung j162 at k1058?
opo sir,yan ng halos ginagamit nila ngayon.mula 100 hanggang 600 watts na design nila.ito rin ang DIY na amp kong ginagamit before.
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Offline edtechph

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Re: SMG 300 WATTS SCHEMATIC
« Reply #137 on: October 27, 2011, 08:32:59 PM »
thnx sir, yung diode ba na yellow yung bang 1n4148 ba pwde dun? tia
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Offline THXneo

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Re: SMG 300 WATTS SCHEMATIC
« Reply #138 on: October 27, 2011, 08:39:12 PM »
Quote from: edtechph on October 27, 2011, 08:32:59 PM
thnx sir, yung diode ba na yellow yung bang 1n4148 ba pwde dun? tia
opo sir, 1N4148 po yan.
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Offline edtechph

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Re: SMG 300 WATTS SCHEMATIC
« Reply #139 on: October 27, 2011, 08:45:42 PM »
anu modification sir nitong smg. and sir meron kang protect circuit nito?
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Re: SMG 300 WATTS SCHEMATIC
« Reply #139 on: October 27, 2011, 08:45:42 PM »
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