No, this is the most recent parts list / circuit diagram: http://www.electronics-lab.com/forum/index.php?topic=19066.msg1010703#msg1010703
I really think someone should update the frontpage to the most recent version. That way everyone would find the most recent version of the circuit and it...
The latest circuit diagram can be found here: http://www.electronics-lab.com/forum/index.php?topic=19066.msg1002666#msg1002666
According to this application note from Fischer Elekronik (heat sink manufacturerer)...
I've got four TIP3055 (TO-218 / SOT 93) here, and two 2N3055 (TO-3). I've decided to use silent CPU coolers. I am uncertain if a single BD139 will be enough to drive four TIP3055s. I am only aiming for 30V / 3A output, so the additional TIP3055s would just be there to compensate for the lower...
Very nice. Is this the latest REV2 version of the PSU or the original version? The shematic seems to be different, and you're only using one output power transistor.
Nothing wrong really.
Audioguru either made a small typo and actually wanted to type
(130°C - 76.4°C)/4.5W = 11.91K/W
or he substracted another 30°C of safety margin from the maximum junction temperature value of 130°C.
(130°C - 30°C - 76.4°C)/4.5W = 5.24K/W
Florian
I noticed that only the original Philips datasheet of the BD139 specifies a value for fT = 190 Mhz. So far I haven't found a transistor in the TO-220 package that's that fast. I think the fastest one I've found so far is the 2SD1762 @90Mhz or so, but the dc current gain doesn't seem to be as...
Ah thanks. I'll have to adjust my calculations then.
I've got a 160 VA transformer with 1x 230V primary and 2x 15V (5,33A) secondary windings.
Im going to put the secondary windings in series so the resulting RMS voltage should be 30V.
My rectifier bridge drops 1.1V for each diode inside of...
Hello once again. I still haven't managed to build this supply even though I designed my own PCB, which probably is still crap. Who cares.
The reason I post here today is because I finally want to finish the PSU and I am not sure what type of heat sink I should pick for Q2 (BD139). It only says...
Thanks for the hint regarding Q3. That sure saved me a lot of trouble.
I revised my schematic so that the ref names of the components in the schematic are matching the original schematic.
Also it should be a little more easy to read it now as I used bigger font sized in most places.
I also...
Sorry about the popups. I usually use some ad blocking meassures (like Adblock+ or Proxomitron) to get rid of ads. So I didn't even notice the pop up infestation of that page. I will re-upload the files once i get my main PC back to work (currently using my gaming PC).
Um ... I recon that not...
Oh yeah you're right, I actually leared that stuff at technician school, but I am a little rusted. I think there is also a spreadsheat by Fischer Elektronik that explains the process. I'm going to look it up.
Found it: >> PDF <<
Hello again,
I got a question regarding the heatsink of the BD 139 transistor. I think "a pretty big heatsink" is a bit vague/relative. Could someone translate "pretty big heatsink" into a