I drew that , just to emphasize that diode and transistor are within same part - 4N35 , which is optocoupler
Papa stumbled on using them in Yore Treshold days
Clever Chap , he is ....... using optocouplers when I was still in Spielhosen ....
Papa stumbled on using them in Yore Treshold days
Clever Chap , he is ....... using optocouplers when I was still in Spielhosen ....
I do hope someone designs boards and the store decides to stock them. I have been intrigued by the M2 being a horn speaker owner. I would like to place the M2 boards inside one of my 2 complete Firstwatt clone amps. I will keep the F6 the one I am currently enjoying.
after several years of having that schematic , also having amp in my living room , I'm still flabbergasted
I remember , from dusty papers , amps similar in both simplicity and execution
however , uniqueness of this one is fact that is brought in this era , both in spite and due to modern era parts and habits of how to use them
you'll hardly find both simpler (or even "just" equally simple) and more capable of doing what is made for
True Papa's Koan , isn't it .
I remember , from dusty papers , amps similar in both simplicity and execution
however , uniqueness of this one is fact that is brought in this era , both in spite and due to modern era parts and habits of how to use them
you'll hardly find both simpler (or even "just" equally simple) and more capable of doing what is made for
True Papa's Koan , isn't it .
I've used one on and off for about 18 months. I can only compare it to
a diy Aleph 30 and I find the M2 more lively. Very enjoyable.
Thank you Papa for making this available.
Dennis
a diy Aleph 30 and I find the M2 more lively. Very enjoyable.
Thank you Papa for making this available.
Dennis
I have tried to find the Edcor PC600/15K transformer with no luck. I can only guess it was made specifically for Firstwatt. What transformer did you use Zen Mod?
Just use a Jensen with the right turn ratio.
I think voltage gain of amp is around 6
After much head scratching on my part this is the transformer I came up with. You will have to change the type in the box to 600 ohm to 15 K ohm.
https://www.edcorusa.com/pc_series
https://www.edcorusa.com/pc_series
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That's a very nice website. Last time I looked at it, it was probably 3 years ago, seems like you have been adding quite a bit to the site.
If I become even more lazy than I already am now, I would definitely be interested in some of your pcbs
Iq is aroundish 1A5
tweakable varying LED series resistor or including some resistance in series to bjt part
all speaking of 4N35
tweakable varying LED series resistor or including some resistance in series to bjt part
all speaking of 4N35
One thing that is a very nice feature but not often included, is an extra place to for an additional source resistor for paralleling to tweak value of source resistors.
The only other thing would be to ensure big Elna Silmic caps will fit on the PCB.