I would try Lazy Cat's VSSA. But please notice that the DRAIN and SOURCE pins are reversed on these vs. the classic audio MOSFETs 2sk1058/2sj162.
VSSA Lateral MosFet Amplifier
And since these do not have gate Zener's - I would add them.
I have built several of the VSSA's a prototypes and they are so simple you can build them on solder lugs: Lot 10 Phenolic Solder-Terminal Strip 10pos 3PS6-10 NOS | eBay
Good luck.
VSSA Lateral MosFet Amplifier
And since these do not have gate Zener's - I would add them.
I have built several of the VSSA's a prototypes and they are so simple you can build them on solder lugs: Lot 10 Phenolic Solder-Terminal Strip 10pos 3PS6-10 NOS | eBay
Good luck.
I think PMA has some designs that use these devices. you might have to check his web site.
And these have a different pinot from laterals because they are NOT laterals!
mlloyd1
And these have a different pinot from laterals because they are NOT laterals!
mlloyd1
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How can I use it in this diagram
https://cdn.shopify.com/s/files/1/1006/5046/files/P-F4-1V20-schematic.pdf
Hitachi came up with a lateral mosfet amplifier circuit.
Maplin copied it and sold many.
Maplin copied it and sold many.
An externally hosted image should be here but it was not working when we last tested it.
Talking of the classic Hitachi circuit are there some modern equivalents to
2SA872A/2SB716/2SD756 recommended? They are getting rare, and high in
everything useful (gain, bandwidth, voltage, power).
Of course there are better circuits, but its an 80's classic... (actually a bit more 1980 I think)
2SA872A/2SB716/2SD756 recommended? They are getting rare, and high in
everything useful (gain, bandwidth, voltage, power).
Of course there are better circuits, but its an 80's classic... (actually a bit more 1980 I think)
I did my own modern copy of the circuit.
For the front end I used MPSA42's and MPSA92's
I wouldnt use the 30pf caps though they need to be be at least 47pf or even 100pf. I also decoupled the front end for better noise performance.
Will the supply be suitable for 2x35v dc?
What should be the value of L1
Which transistors can I use instead of A872, D756, B716.
Nothing wrong with using 2n5401 for the IPS, KSC3503 in the VAS
Need a way to control your OPS bias current, put a low ohm pot in series with the diodes
Add some Emitter degeneration resistors on the IPS
Zener clamps for the gate drives
and list goes on.
Need a way to control your OPS bias current, put a low ohm pot in series with the diodes
Add some Emitter degeneration resistors on the IPS
Zener clamps for the gate drives
and list goes on.
no.
those mosfets are not lateral mosfets; the zero tempco point of the 2sk413/2sj118 series is VERY different from the one for the lateral mosfets in the 2sk1058/2sj162 series!
see data sheet excepts below.
the simple bias network will not work properly with non-lateral devices!
mlloyd1
those mosfets are not lateral mosfets; the zero tempco point of the 2sk413/2sj118 series is VERY different from the one for the lateral mosfets in the 2sk1058/2sj162 series!
see data sheet excepts below.
the simple bias network will not work properly with non-lateral devices!
mlloyd1
Attachments
Thats pretty much the same as the one i gave earlier.
For front end I used MPSA42 and MPSA92 as per type.
For output laterals you can use laterals from profusion or exicon.
+/45 volts would be good into 8 ohms.
The inductor was about 10 turns on a 3 watt 10R resistor.