Future of the J201 - Moving forward
- Thread starter Robert
- Start date
Nostradoomus
Well-known member
A DCA55 or 75 is definitely on my list. The dinky component tester only goes so far. Its fine for SMD Fets but doesn’t give me a clue about old GE components haha
the_grumpy_gnome
Active member
SMD-only is logical and not going to be an issue for many, but I'm concerned that people new to pedal building or new to soldering are going to have a lot of trouble with SMD stuff. I suggest that projects which require them include a warning on the project page, as well as possibly a supplemental alignment illustration in the project .pdf.
Regarding SOT23 testing, I've just discovered Peak do an adapter: https://www.peakelec.co.uk/acatalog/pca23-peak-component-adapter-sot23.html#SID=27
I wonder if the clip is generally available and could be built into a JFET matching board?
I wonder if the clip is generally available and could be built into a JFET matching board?
Mourguitars
Well-known member
So....the J201's i bought off eBay most likely not be good ? I went to Tadya and put in my cart the SMD 201"s for my next order and ill get the boards here from PedalPCB any other JFET's i need to worry about be hard to obtain with out paying a arm and leg for ?
It is what is is on parts and don't mind using SMD unfortunately its the trend going forward ... The KTR went SMD i under stand that , but a lot of us are old school on things , im that way but learning new things keeps me sharpe..well, i would like to think so anyway ! lol
Mike
It is what is is on parts and don't mind using SMD unfortunately its the trend going forward ... The KTR went SMD i under stand that , but a lot of us are old school on things , im that way but learning new things keeps me sharpe..well, i would like to think so anyway ! lol
Mike
Nostradoomus
Well-known member
Yeah any JFET through hole on eBay is pretty dicey unless it’s currently in production in which case it’s still kinda dicey.
Mourguitars
Well-known member
K Pedals
Well-known member
Yeah I’d definitely socket ‘em...
Is it, damn, I already had some 2N5457s and just got 50 J201s!
It only dawned on me recently that different makes have different product codes for the SMD J201:
On semiconductor: MMBFJ201
InterFet: SMPJ201
Vishay: SST201
Maybe we could have a list? I've been waiting two months for MMBFJ201's to be available in the UK, if I'd twigged earlier that the MMBFJ201 was only On semiconductors product code, not the product code for all SMD J201s I might have been able to get some earlier.
On semiconductor: MMBFJ201
InterFet: SMPJ201
Vishay: SST201
Maybe we could have a list? I've been waiting two months for MMBFJ201's to be available in the UK, if I'd twigged earlier that the MMBFJ201 was only On semiconductors product code, not the product code for all SMD J201s I might have been able to get some earlier.
Sorry, I completely missed your post Nostradoomus, I have a similar device
This is the results I get for a MMBF5458... Now I need to go a learn what it's telling me! A quick look at the data sheet and I'm none the wiser
(The JFET was pushed down onto the pads to get the reading)
Chuck D. Bones
Circuit Wizard
This gives you one point on the transfer function. The Vg displayed is actually -1.0V. It looks like a healthy device, that's about all we can tell. That tester looks pretty slick, I just ordered one.
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