Showing posts with label 100W Subwoofer. Show all posts
Showing posts with label 100W Subwoofer. Show all posts

4/22/2014

100W Audio Amplifier with MUTE/ST-BY

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General description:


  • VS - Supply Voltage (No Signal) ±50 V
  • IO - Output Peak Current 10 A
  • Ptot - Power Dissipation Tcase= 70°C 50 W
  • Top - Operating Ambient Temperature Range 0 to 70 °C
  • Tstg,- Tj Storage and Junction Temperature 150 °C

Amplifier circuit diagram

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Layout circuit diagram

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100w audio amplifier

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General description:

 

All resistors are standard metal film 250mW except: R1/3/4/7, these are 2W metal film, and the 0.22ohm beeing 5W. Around R7 is wounded a 0.6mm isolated (enamelled) copper wire forming the output coil. (~12 windings)  For c19 i used 470uf/16v, all other electrolytics 63v. The 10/100/330pF should be mica-caps. The 100nf and 47nf is recommended to be Wima MKS2 (or better), also for C1 i suggest Wima MKS2, 4.7uf is enough. For Trimpot i use a Piher. The MPSA18 can be substituted by BC550C, for all other parts i do not recommend changes, especially the feedback network (r29/30) should be kept unchanged, feedback compensation is very delicate for this circuit ! Be careful when substituting the MPSA18 with BC550C, the pinout is reversed between these 2 transistors !!! The bias is adjusted via the trimpot (R22). Recommended bias is 55ma, resulting in 12mv across a single 0.22ohms or 24mv across both 0.22ohms. Connect a DMM to the upper wires of these resistors and adjust trimpot until DMM reads wanted voltage.

Features:

 


THD: ~0.005% (measured) sim'd: 0.002%
Power into 8ohm: 60 watts
Power into 4ohm: 100 watts
Gain: 32dB (~1:40) full output at 0.7v input (0.5v rms)
Feedback: 57dB
GainBandWidth: ~400Mhz
Slewrate: ~20v/us (symetrical)
Supply voltage: +/- 36v
Biasing: 55ma, ~12mv across a single 0.22 ohm
Measurings:The measuring setup itself is far from perfect, but gives a good idea !
Frequency response: 3.2hz to 145khz (-1db) using 4.7uf input cap
Phaseshift at 10khz: <3°
More will follow !

Circuit Diagram:

100w audio amplifier  circuit diagram

 

Layout Diagram:

100w audio amplifier  layout diagram


Partlist:


Device
Qty
Value
Notes
Q1,Q2
2
MPSA18
can be substituted by BC550C (pins reversed !)
Q7,Q8
2
BC546B
or maybe 2n5551 (pins reversed !)
Q3,Q9
2
2N5551
OnSemi/Fairchild/Philips
Q4,Q5,Q12
3
2N5401
OnSemi/Fairchild/Philips
T1
1
BD139
or bd135, bd135-16
U$5
1
MJE15030
OnSemi
U$6
1
MJE15031
OnSemi
U$3
1
MJL3281A
OnSemi
U$4
1
MJL1302A
OnSemi


Device
Qty
Value
Notes
C14
1
10pF (has been 22pF)
Mica
C2,C7
2
100pF
Mica
C3,C4
2
330pF
Mica
C18
1
47nF
Wima MKS2
C5, C6, C10, C11, C16, C17, C20
7
100nF
Wima MKS2
C1
1
10uF (4.7uF also fits)
Wima MKS2
C8,C9
2
100uF
Electrolytic 63v (at least 40v)
C19
1
470uF
Electrolytic 16v
C12,C13
2
1000uF
Electrolytic 63v (at least 40v)


Device
Qty
Value
Notes
R27,R28
2
0R22
5Watts
R1, R3
2
1R2
2Watts metal film
R4
1
4R7
2Watts metal film
R7
1
10
2Watts metal film
R2
1
10
250mW metal film
R8, R9
2
22
250mW metal film
R31, R32
2
47 (have been 22)
250mW metal film
R26
1
33
250mW metal film
R10
1
68
250mW metal film
R15,R17
2
150
250mW metal film
R11
1
220
250mW metal film
R24,R30
2
499 (or 500)
250mW metal film
R5,R6
2
680
250mW metal film
R13,R23
2
2k
250mW metal film
R12,R14,R29
3
22k
250mW metal film
R18,R20
2
47k
250mW metal film
R22
1
1k pot
Piher, small (470ohm might be better)

Device
Qty
Value
Notes
F1,F2
2
2.5T Fuse
Slow blow
F1,F2
2
---
Fuse holder
L1
1
---
0.6mm isolated (enamelled) copper wire wounded around R7 forming the output coil.

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