Class-AB Power Amp

Power Amp


Komponen (dari saya):
R1, R7 = 22k ; ⅛W
R2, R6 = 1k ; ⅛W
R3 = 220 ; ⅛W
R4 = 560 ; ⅛W
R5 = 10k ; ⅛W
R8 = 100 ; ¼W
R9, R10 = 1k5 ; ¼W
R11 = 470 ; ¼W
R12, R13 = 0R47 ; 2W
R14 = 10 ; ½W

C1 = 2u2 / 50V
C2 = 1n / 63V
C3 = 100p
C4, C5 = 100u / 35V
C6 = 220n / 63V
C7, C8, C9 = 100n / 63V

Q1, Q2, Q3 = BC549C
Q4, Q6 = BD140
Q5 = BD139
Q7 = TIP41A/B/C
Q8 = TIP42A/B/C

D1 = IR LED
D2, D3 = 1N4148

mari kita bahas/pelajari cara kerjanya....

Power Supply



AC = 220-0 Vac
T1 = 5A, 220-0 : 18-0-18 (18Vct)
BR = Dioda Bridge 10A
C1~C4 = 4700uF / 35V

asyik 18VCT, kebetulan ada trafo yg ga kepake nih mumpung lagi ga sibuk wkakak, ngerjain yg ga ada kerjaa..

lanjut kang sue,...

ikutan nonton

ya sama

wkkk gainnya sama dengan GC 22/1.
Q4 kebesaran cari yang tipe dibawahnya aja kayak B560.
R6 Pake NTC.. sekian dulu dari saya..

D1 buat apaan yah ?

Wah gimana neh, malah pada liat aja, jangan ada yang rakit dulu, itu racikan saya (komponen & skema) belum tentu bagus suaranya walaupun saya yakin bakal jalan (tapi menurut saya kualitas high freq-nya lebih detail daripada yang biasa di pasaran)...

*maksud saya di bahas per fungsi dan penentuan komponen, misal HPF, LPF, CCS, miller, Slew Rate, Bootstrap, Emitter-Follower, Gain voltage, dll.dll.

D1 adalah IR LED, V_drop-nya (~1,2V) digunakan untuk V_ref (tegangan acuan) untuk bagian CCS (D1, R3, R5, Q3). saya pilih IR LED karena punya noise yang rendah (~lebih rendah dari zener biasa dan LED warna). jadi arus yang keluar di collector Q3 bisa lebih smooth (walaupun hanya secuil).
nah, ini ntar ada hubungannya dengan (output) DC offset voltage ga?

@gwendy: kenapa Q4 pakai Tr yang lebih kecil, berapa Power dissipation di Q4? hayo,,, saya ga tau nieh,,, hi hi hi

Memantau aja deh
GAK MUDENG BLASS . bwahahahahahha

wah, bener juga yak, dipikiran saya cuma -gimana cara nentuin komponen (kalkulasi) & relasinya.

Mesti tau dulu neh, definisi dan konstruksi Power Amp (Class-AB) biar ga saling silang pembahasan dan perhitungannya.

ayo yang paham dimulai... atau yang fasih menerjemahkan bahasa Inggris teknik, dengan menyadur dari sumber di luar (yg terpercaya)...

OL dari HP, jempol saya bisa membekas abjad ABC123 neh kalo ngetik satu artikel dari HP...

mirip OCL safari

Quote :

@gwendy: kenapa Q4 pakai Tr yang lebih kecil, berapa Power dissipation di Q4? hayo,,, saya ga tau nieh,,, hi hi hi

iya pakai B560 atau B544 sudah cukup ( atau malah BC559C ) kalau TR itu biasanya hanya 1/10 s.d 1/20 dari TR ending kalau pakai BD139 keknya kebesaran untuk oCL biasa, sedangkan oCL safari 1/1 sama dengan drivernya (berarti nilai drivernya cocok)...

( pakai cara coba-coba aja ini jangan diikuti rumus pastinya masih diperpustakaan dan berbahasa inggris )

yah, kira-kira...

kalau ga salah collector Q4 saya kasih arus dari bootstrap sekitar ~8,3mA.
jadi power dissipation di Q4 sekitar 25V * 8,3mA = 207,5 mW, bener gak?
kalau pakai Tr model TO-92 bisa gerah banget Pd segitu, kasihan (ga awet)...

lebih baik dicoba, untuk OCL safari saja dengan suply lebih tinggi say pake BD139 gpp klu voltage 18 V dan R segitu bakalan gak apa apa menurut saya, kecuai dari depan sdh salah karena saya kurang setuju dengan pemakaian led untuk catu arus diffrensial, say lebih pilih 2 dioda diseri menggantikan led.

anj***....
baru nulis satu artikel,,,, mati listrik

gwendy wrote:

klu voltage 18 V dan R segitu bakalan gak apa apa

R yang mana gwen?

gwendy wrote:

menurut saya, kecuai dari depan sdh salah karena saya kurang setuju dengan pemakaian led untuk catu arus diffrensial, say lebih pilih 2 dioda diseri menggantikan led.

alasan?

R 1k5 ( R9/10 ) R4.
dioda led tdk stabil dan memberi lebih banyak noise kepada rangkaian.

ada orang diyaudio ngukur noise, lumayan buat referensi.

Noise measurements for LEDs and zener diodes
--------------------------------------------

(C) Christer at DiyAudio.com
You are allowed to copy and use this information for your
personal and non-commercial use.


DESCRIPTION OF TEST RIG
-----------------------

The test rig uses three current sources of approx. 1, 5 and 20 mA
built using low-noise BJTs (BC559) to feed the device under test
(DUT) alternatingly. The noise was measured using two op amps in
in non-inverting configuration cascaded, both having a gain of 34,
making a gain of 1156 in total. The first op amp is a very-low-noise
model (LT1115) and uses a gain resistor of only 10 Ohms in the feedback
network. The gain resistor is thus 330 Ohms which works since the op
amp is only expected to output very low-level signals. The second op
amp is a low-noise type (NE5534) with gain and feedback resistors of
100 Ohms and 3.3 kOhms. The output was measured using a PC soundcard
(Creative Audigy LS in 16-bit 44.1 kHz mode). Each measurement consists
of a 10 second capture of the soundcard input and the RMS value for
this 10 s. signal was computed. The program was calibrated (using a
sine wave and an oscilloscope) to give aprroximately correct voltage
readings and all measurements were divided by 1156 to give the equivalent
input RMS noise at the first op amp, ie. at the DUT. No extra filters
except what is on the soundcard were used.


TEST METHOD
-----------

A spectrum of LED types ranging from IR to blue and of approximately
the same type were measured. All LEDS were selected to have an max
If of at least 20 mA, since this current was used in the test. Further
four 0.5W types of zener diodes were tested, two of them (5.6 and 6.8 V)
were deliberately selected close to each other but such that the 5.6 V
diode should be expected to have true zener breakdown and the 6.8 V one
to have avalanche breakdown. The other two were selected to be far away
from this "transition region". Two 1.3W zeners were also tested to see
how the power rating affects noise figures.

For each type of DUT, two devices (denoted #1 and #2 and presumably
from the same batch) were tested at the three test currents 1, 5 and
20 mA and the equivalent noise at the DUT was measured and calculated
as described above. For each combination of device and current, five
10-second measurements were made.

For reference, the voltage drop at each test current
was also measured for one device of each type.


MEASUREMENTS
------------

All values are RMS values

Idle noise:
----------------------------------------------------
Measured idle noise of amplifier with grounded input:
0.19 0.19 0.19 0.19 0.18 uV
(The theoretical max value was calculated to 0.16 uV for
20kHz bandwidth and 0.22 uB for 40 kHz bandwidth).

Measured idle noise of amplifier with 100 Ohm source resistor:
0.26 0.25 0.24 0.26 0.26 uV
(The theoretical max value was calculated to 0.20 uV for
20kHz bandwidth and 0.28 uB for 40 kHz bandwidth).


LEDs:
----------------------------------------------------
(All LEDs of brand Everlight)

IR204/P1 (IR):
#1 @ 1mA: 3.7 3.7 3.7 3.7 3.7 uV
#1 @ 5mA: 0.67 0.66 0.65 0.66 0.66 uV
#1 @ 20mA: 0.24 0.23 0.24 0.23 0.23 uV
#2 @ 1mA: 3.8 3.8 3.7 3.7 3.7 uV (Vf = 1.05 V)
#2 @ 5mA: 0.65 0.64 0.64 0.64 0.64 uV (Vf = 1.11 V)
#2 @ 20mA: 0.24 0.25 0.23 0.24 0.22 uV (Vf = 1.17 V)

EL202HD (red):
#1 @ 1mA: 0.31 0.32 0.31 0.31 0.32 uV
#1 @ 5mA: 0.26 0.26 0.27 0.27 0.27 uV
#1 @ 20mA: 0.39 0.36 0.37 0.36 0.37 uV
#2 @ 1mA: 0.39 0.37 0.38 0.38 0.35 uV (Vf = 1.82 V)
#2 @ 5mA: 0.32 0.30 0.30 0.30 0.31 uV (Vf = 1.89 V)
#2 @ 20mA: 0.41 0.40 0.41 0.41 0.46 uV (Vf = 2.09 V)

EL204ID (red-orange):
#1 @ 1mA: 0.31 0.30 0.31 0.31 0.31 uV
#1 @ 5mA: 0.25 0.26 0.26 0.26 0.24 uV
#1 @ 20mA: 0.41 0.41 0.48 0.40 0.41 uV
#2 @ 1mA: 0.35 0.31 0.29 0.30 0.32 uV (Vf = 1.64 V)
#2 @ 5mA: 0.25 0.26 0.27 0.26 0.30 uV (Vf = 1.74 V)
#2 @ 20mA: 0.40 0.40 0.39 0.40 0.41 uV (Vf = 1.90 V)

EL204YD (yellow):
#1 @ 1mA: 0.42 0.30 0.29 0.29 0.28 uV
#1 @ 5mA: 0.28 0.26 0.25 0.33 0.27 uV
#1 @ 20mA: 0.42 0.39 0.39 0.40 0.40 uV
#2 @ 1mA: 0.31 0.30 0.31 0.30 0.31 uV (Vf = 1.78 V)
#2 @ 5mA: 0.28 0.47 0.28 0.26 0.25 uV (Vf = 1.87 V)
#2 @ 20mA: 0.34 0.34 0.35 0.34 0.34 uV (Vf = 2.02 V)

EL204GD (green):
#1 @ 1mA: 0.68 0.50 0.50 0.47 0.46 uV
#1 @ 5mA: 0.35 0.30 0.28 0.28 0.29 uV
#1 @ 20mA: 0.36 0.35 0.35 0.35 0.35 uV
#2 @ 1mA: 0.46 0.46 0.44 0.44 0.41 uV (Vf = 1.82 V)
#2 @ 5mA: 0.36 0.33 0.32 0.33 0.32 uV (Vf = 1.92 V)
#2 @ 20mA: 0.39 0.40 0.39 0.41 0.40 uV (Vf = 2.12 V)

EL204UBD (blue):
#1 @ 1mA: 4.6 4.5 4.6 4.5 4.6 uV
#1 @ 5mA: 3.2 3.2 3.2 3.2 3.2 uV
#1 @ 20mA: 2.8 2.8 2.7 2.7 2.7 uV
#2 @ 1mA: 4.4 4.4 4.3 4.2 4.3 uV (Vf = 3.26 V)
#2 @ 5mA: 3.1 3.2 3.2 3.1 3.2 uV (Vf = 3.44 V)
#2 @ 20mA: 2.9 2.8 2.8 2.8 2.7 uV (Vf = 3.69 V)


Zeners:
---------------------------------------------------------
(All zeners of brand Temic.)

BZX55/C2V7 (0.5W 2.7V):
#1 @ 1mA: 1.1 1.1 1.1 1.1 1.1 uV
#1 @ 5mA: 1.0 0.88 0.85 0.86 0.87 uV
#1 @ 20mA: 1.0 0.81 0.72 0.72 1.1 uV
#2 @ 1mA: 1.2 1.1 1.1 1.1 1.1 uV (Vr = 2.03 V)
#2 @ 5mA: 0.91 0.88 0.87 0.86 0.85 uV (Vr = 2.50 V)
#2 @ 20mA: 1.1 0.80 0.77 0.73 0.71 uV (Vr = 3.02 V)

BZX55/C5V6 (0.5W 5.6V):
#1 @ 1mA: 5.3 5.3 5.3 5.3 5.3 uV
#1 @ 5mA: 2.9 2.9 2.9 2.9 2.9 uV
#1 @ 20mA: 1.7 1.6 1.6 1.6 1.6 uV
#2 @ 1mA: 5.3 5.3 5.3 5.3 5.3 uV (Vr = 5.68 V)
#2 @ 5mA: 2.9 2.9 2.9 2.9 2.9 uV (Vr = 5.77 V)
#2 @ 20mA: 1.8 1.6 1.6 1.6 1.6 uV (Vr = 5.81 V)

BZX55/C6V8 (0.5W 6.8V):
#1 @ 1mA: 16 16 16 16 16 uV
#1 @ 5mA: 21 21 21 21 21 uV
#1 @ 20mA: 5.8 5.5 5.5 5.5 5.6 uV
#2 @ 1mA: 25 25 25 25 25 uV (Vr = 6.93 V)
#2 @ 5mA: 13 13 13 13 13 uV (Vr = 6.96 V)
#2 @ 20mA: 4.6 4.7 4.5 4.5 4.4 uV (Vr = 7.00 V)
(Rechecked both devices due to their inconsistent
behaviour for 1 and 5mA).

BZX55/C12 (0.5W 12V):
#1 @ 1mA: 0.35 0.37 0.37 0.39 0.39 uV
#1 @ 5mA: 0.30 0.28 0.28 0.28 0.30 uV
#1 @ 20mA: 0.24 0.25 0.25 0.26 0.25 uV
#2 @ 1mA: 0.32 0.33 0.32 0.33 0.32 uV (Vr = 11.32 V)
#2 @ 5mA: 0.26 0.26 0.27 0.32 0.26 uV (Vr = 11.37 V)
#2 @ 20mA: 0.25 0.26 0.28 0.24 0.30 uV (vr = 11.42 V)

BZX85/C2V7 (1.3W 2.7V):
#1 @ 1mA: 0.77 0.77 0.77 0.77 0.76 uV
#1 @ 5mA: 0.62 0.61 0.63 0.61 0.60 uV
#1 @ 20mA: 0.55 0.55 0.54 0.55 0.55 uV
#2 @ 1mA: 0.78 0.78 0.78 0.78 0.78 uV (Vr = 1.30 V)
#2 @ 5mA: 0.62 0.62 0.61 0.62 0.62 uV (Vr = 1.61 V)
#2 @ 20mA: 0.57 0.56 0.57 0.56 0.56 uV (Vr = 1.92 V)

BZX85/C12 (1.3W 12V):
#1 @ 1mA: 0.49 0.53 0.48 0.50 0.52 uV
#1 @ 5mA: 0.54 0.55 0.58 0.46 0.48 uV
#1 @ 20mA: 0.44 0.35 0.38 0.36 0.33 uV
#2 @ 1mA: 0.42 0.43 0.46 0.48 0.41 uV (Vr = 9.84 V)
#2 @ 5mA: 0.40 0.35 0.35 0.37 0.29 uV (Vr = 9.89 V)
#2 @ 20mA: 0.34 0.33 0.31 0.30 0.31 uV (Vr = 9.94 V)

-----------------
#1 @ 1mA:
#1 @ 5mA:
#1 @ 20mA:
#2 @ 1mA:
#2 @ 5mA:
#2 @ 20mA:

jari kang sue sampe keriting

disana gak ukur dioda 4148 yah

mungkin ga ada yang jual kali kang gwendy 1N4001 s.d 1N4009 juga ga ada..