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2sa1015, 2sc1815, 2sk1825 and LMC660 EU replacements?

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neazoi

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I am looking for replacement suggestions for the LMC660, and the transistors used in the circuit attached 2sa1015, 2sc1815, 2sk1825.

I have lots of tl071 and most common hobbyist transistors 2n2222 2n2907 BC549 etc


Also, I want to combine the decoder with a kind of same technology CW encoder MCI-less. Any ideas of how it could be done? (techniques, technologies etc).
I was thinking of some kind of a diode matrix and a way to run through it, but I may be on the wrong path.
 

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Hi,

That's cheeky ;-), you can easily look at any substitute part website or manufacturer's parametric search tools for substitutes... Just check the basic specs and go from there. For example, those transistors look like general purpose amplifier BJTs, the MOSFET might be a logic-level device, and that rail-to-rail out, 3mV Vos quad op amp has hundreds of suitable replacements.

Quick specs to look for:

https://www.el-component.com/bipolar-transistors/2sa1015

https://alltransistors.com/transistor.php?transistor=6792

https://alltransistors.com/mosfet/transistor.php?transistor=14752

https://www.ti.com/product/LMC660

Encoder and decoder ICs are more expensive than diodes or logic but might save a lot of work, pcb space and headaches. I'd hate to truth table or Karnaugh map that... I don't know if this kind of IC pair or similar could fit your application like a BCD IC. Look through National Semiconductor CMOS and TTL databooks and there may be a few useful parts if you get lucky or can think through how to adapt a device or three to your needs. I scour datasheets to get ideas and be impressed at other people's skill and intellect.

https://www.inventelectronics.com/product/ht12e-and-ht12d-encoderdecoder-pair/
 
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