The request for Global demands for Tip 142-147 raised after that but manufacturers don't know how to make them any more ....One claims that cooking instructions lost just after WW2
I still can not get to work emu usb 0404 sound-card under windows 10 (beta driver does not work - it freezes my computer - it's time to buy something new ...
) ... hope someone will build this and measure the harmonic spectrum correctly. 😀 The amplifier works still perfectly - low frequencies are great ... and other frequencies also satisfy me. Bias / offset very stable also.
) ... hope someone will build this and measure the harmonic spectrum correctly. 😀 The amplifier works still perfectly - low frequencies are great ... and other frequencies also satisfy me. Bias / offset very stable also.Attachments
Hi everyone,
Has someone tried the Kroto's PCB or everyone is still waiting for the official Papa's version?
Damien
Has someone tried the Kroto's PCB or everyone is still waiting for the official Papa's version?
Damien
Maybe they're waiting for the board layout to facilitate Sanken STD03N/STD03P devices.
(it's said, best ever audio darlingtons on the block)
(it's said, best ever audio darlingtons on the block)
Would I have to make many changes to the circuit to use +-60V for this amplifier? I have a transformer out of an Onkyo tx-nr709 on hand that would yield this...or should I just buy a proper transformer to yield the +-50?
Yes i agree - these will fit for 60V rails ! What transistors would you place in VA stage? I measured in LT spice - bd140 / 139 gives a little lower 2H than MJE 340/350, although the total THD is the same almost at bias 50mA per output transistor and 1W output at 1 an 10 Khz (my LT spice and real "amp" amplifier have a reduced gain from original article ).
the same here - either bd / mje from local good suppliers or ksa or Japanese transistors from ebay (with a great % to buy fake), but BDs will be .I would like to have transistors with a slightly higher V than BDs for 60 V rails..
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MJE 340/350 look more attractive then, and still very easy to source through Mouser. I appreciate all your help and guidance osscar... Thank you.
I throw them in spice - seems works fine - reduced second harmonic, no oscillation.
.MODEL Q2SA1930 PNP(
+ IS=10.000E-15
+ BF=210
+ VAF=78
+ IKF=10.000E-3
+ XTB=1.5
+ BR=.1001
+ VAR=100
+ IKR=10.000E-3
+ ISC=10.000E-15
+ CJE=3.252E-12
+ CJC=63.196E-12
+ MJC=.33333
+ TF=83.239E-12
+ XTF=10
+ VTF=10
+ ITF=1)
.MODEL Q2SC5171 NPN(
+ IS=10.000E-15
+ BF=210
+ VAF=100
+ IKF=10.000E-3
+ XTB=1.5
+ BR=.1001
+ VAR=100
+ IKR=10.000E-3
+ ISC=10.000E-15
+ CJE=2.0000E-12
+ CJC=38.866E-12
+ MJC=.33333
+ TF=83.239E-12
+ XTF=10
+ VTF=10
+ ITF=1)
.MODEL Q2SA1930 PNP(
+ IS=10.000E-15
+ BF=210
+ VAF=78
+ IKF=10.000E-3
+ XTB=1.5
+ BR=.1001
+ VAR=100
+ IKR=10.000E-3
+ ISC=10.000E-15
+ CJE=3.252E-12
+ CJC=63.196E-12
+ MJC=.33333
+ TF=83.239E-12
+ XTF=10
+ VTF=10
+ ITF=1)
.MODEL Q2SC5171 NPN(
+ IS=10.000E-15
+ BF=210
+ VAF=100
+ IKF=10.000E-3
+ XTB=1.5
+ BR=.1001
+ VAR=100
+ IKR=10.000E-3
+ ISC=10.000E-15
+ CJE=2.0000E-12
+ CJC=38.866E-12
+ MJC=.33333
+ TF=83.239E-12
+ XTF=10
+ VTF=10
+ ITF=1)
Thank you oscar. I am a newb and have not learned to use simulators. I really appreciate your help.
DOGC-H amplifier by Dr. Borivoje Jagodic -pcb
Please send pcb format in pdf of DOGC-H amplifier by Dr. Borivoje Jagodic
Please send pcb format in pdf of DOGC-H amplifier by Dr. Borivoje Jagodic