Hi again spec.
I've had a look at a few replacement options for the 2N3055, but just wanted to ask your advice as to which on to buy.
If I search for the part number 2N3055, virtually everything I find is a NPN transistor, but the manual clearly states, but it could be wrong of course, given the other errors I've seen in it, that Q42 is a PNP transistor.
The parts list shows it as -60v 1A 30W PNP part number TIP30A
Searching on ebay, if I search for the words 2N3055 and PNP - it only finds 6 sellers, selling 2N3055 NPN paired with MJ2955 PNP transistors.
If I search with NPN instead it finds 62 results, all of which are NPN.
going on a wikepedia search, not always the most reliable source I know, it looks like it certainly is a NPN:
https://en.wikipedia.org/wiki/2N3055
Do you think the manual just got it wrong?
I checked a site I regularly buy components from - rscomponents, again using 2N3055 as the search term, it only finds two NPN transistors.
eg:
https://au.rs-online.com/web/p/bipolar-transistors/5452210/
https://au.rs-online.com/web/p/bipolar-transistors/7743212/
Both are NPN, but have differing specs,
ie,
Maximum Operating Frequency is 2.5MHz for the 2N3055G as opposed to the 2N3055AG, which is 1MHz.
Also, the Maximum Collector Emitter Saturation Voltage is 3Volts and 5 Volts respectively.
BUT, assuming the manual did actually get it wrong, would either of those to transistors be a suitable replacement?
Its all rather confusing I must say.
Speak soon.
Josh
Hi Josh,
You have my sympathies- manuals are very often wrong, sometimes in the most critical areas.
Just to confirm, the power transistor in the inverter is a 2N3055 which is an NPN high power transistor. It is implementing a simple function in your scope so any 2N3055 will be OK, 2n3055H for example.
2N3055 is by far the most widely used high power transistor, and is available cheaply from many manufacturers and suppliers at a very low price.
As, a general rule, it is best to get your electronic components from a reliable source, definately not Ebay. The reason for this is that there a many rip off components on Ebay which do not meet their data sheet specifications. **broken link removed**
The 2N3055 also has a PNP compliment, the MJ2955
https://www.onsemi.com/pub_link/Collateral/2N3055-D.PDF
Some Suppliers:
https://uk.farnell.com/multicomp/2n...crid|78108290589|&CAWELAID=120173390001314700
https://www.cricklewoodelectronics....hJSXvXcg5Mg6n4bwnQyxV4uTFOYY_zeXcYaArBs8P8HAQ
https://www.futurlec.com/Transistors/2N3055pr.shtml
https://uk.rs-online.com/web/p/bipolar-transistors/7743212/
Cheers
spec
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