From: Subject: The Ampz Pages - how to set the DPA 220 Date: Fri, 7 Mar 2003 14:58:35 +0100 MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_006D_01C2E4BA.06FC1930"; type="text/html" X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4522.1200 C'est un message de format MIME en plusieurs parties. ------=_NextPart_000_006D_01C2E4BA.06FC1930 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://margo.student.utwente.nl/el/ampz/set220.html The Ampz Pages - how to set the DPA 220

How to set the DPA = 220


  • Set the R13 to the middle position and the R23 to minimum=20 resistance.=20
  • Connect a signal generator to the input and an oscilloscope = to the=20 output.=20
  • Take out a fuss in one branche of power supply and connect a = current=20 meter instead.=20
  • Slowly raise the supply voltage above zero and watch the = current.=20 Since about +/- 3 V the amp should start to work and there = should be=20 symmetrically limited signal at the output. If the current does = not grow=20 too high (30 mA), raise the voltage to the full +/- 40 V and = raise the=20 input signal to check the symmetry of limitation.=20
  • If everything's all right, connect 4/8ohms/100W load and = raise the=20 signal level to 3 dB under limitation. When the power = transistors grow=20 hot (5 minutes?) set the signal generator to 20 kHz at the = output=20 voltage of the amp 1V. A distortion should be visible on the = sinusoid -=20 eliminate it by raising the BIAS current by R28. A correctly set = amp=20 should have a BIAS current about 50 mA in each branch of power = supply.=20
  • Then connect a DC voltage meter to the output and by R13 set = as=20 small DC output voltage as possible. 10 mV is acceptable, 1 mV = is=20 possible with a bit of patience.=20
  • You can check frequency response if you want.=20
  • In the end you can check the current securing circuit :=20
    • Shorten the output with a 0.1 ohm resistor=20
    • Set the input signal to 1 kHz/500mV.=20
    • Slowly raise the supply voltage - there should appear a = sharply=20 limited signal on the output with small glitches on the front = edges.=20
    • If the circuit works as described, you can try complete = short=20 circuit at the nominal voltage - the current consumption = should be=20 about 3A in each branch of the supply. =

My own=20 advice: when you start and set the amp for the first time - or any = other=20 circuit - be absolutely careful. When changing configuration of = signal=20 generator, oscilloscope, meters and load, ALWAYS switch off = the=20 power supply. I even unplug it ever since i burned a = TDA2040.
Another=20 practice has proven useful over the years: for the first power-up, = replace=20 fuses in both power supply rails with lightbulbs - I'm using = regular 100W=20 / 240V bulbs. Naturally you mustn't apply load to the amp's output = in this=20 setup. If something goes wrong, the lightbulbs start to glow and = basically=20 limit the current flowing through the circuit. If everything's = right, the=20 lightbulbs remain cool and the amp behaves as expected. Then you = can try=20 to make them glow by turning the bias-current trimpot. If you = succed, you=20 know you have another clue everything is working fine. Then you = turn the=20 bias current back to zero, put the fuses back and you can proceed = with the=20 aforementioned procedure.
In general, it cost me about a = handful of=20 transistors to gain this knowledge. Note that the frequency = response is a=20 full graph and measured 1 dB under limitation (=3Dmaximum sinus = power) -=20 when measuring voltage, value in decibels =3D 20 log = (amplification) - 6 dB=20 means amplification 2x.





You can Email Rysanek=20 Frantisek who sent me this info.

=20
WE-MAN!'s electro page


You can = Email=20 Stefan Wieman (for HTML comments) at s.wieman@tudent.utwente.nl= =20
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