thank you miles, i tried strings of little diodes to 2.7 and lower, but still the regulator is unresponsive, with 23v output voltage.
i would like to rebuild it, but only spare parts i have are bc550/560 and bd139/140.
can these work as small transistors?
i would like to rebuild it, but only spare parts i have are bc550/560 and bd139/140.
can these work as small transistors?
I have built and tested apex 14 sound good but doesn't matched Esp tone control to expanded more bass as it does to p3a so which tone control is suitable for apex A14 to enhance more bass?
Thanks i will update more details after finishing TB1and TB3 combined with apex A14
Apex FH9-with IRF540/9540
Hi,
Completed Apex FH9 with IRF540/9540 withe the following modifications:
Driver transistor used: KSC1381/3503
Reduce the capacitor from collector to base to 33pF.
Sounds nice...
Thank you Mr. MIle, XRK, SK KAchhap and Prasi.
I don't have access to oscilloscope.
Please clarify my doubts:
What is the maximum supply voltage for 4R load with 1 pair of IRF540/9540.
Will there be any stability issues if we reduce the capacitor on collector to base of the driver transistor?
Will there be any improvement in the audio quality if the LTP transistors are changed to 2SC2240?
Kindly reply.
Thanks and regards,
Sumesh
Hi,
Completed Apex FH9 with IRF540/9540 withe the following modifications:
Driver transistor used: KSC1381/3503
Reduce the capacitor from collector to base to 33pF.
Sounds nice...
Thank you Mr. MIle, XRK, SK KAchhap and Prasi.
I don't have access to oscilloscope.
Please clarify my doubts:
What is the maximum supply voltage for 4R load with 1 pair of IRF540/9540.
Will there be any stability issues if we reduce the capacitor on collector to base of the driver transistor?
Will there be any improvement in the audio quality if the LTP transistors are changed to 2SC2240?
Kindly reply.
Thanks and regards,
Sumesh
Attachments
Very nice, APEX FX-8 Bimo mod!,
Builder's Clan is becoming strong; I need become a member, sooner than later😉.
regards
Prasi
Hi
I would like to build the A9 but can’t find any IRF540/9540 from a reliable source like Digikey, etc.
Some help would be great. I’ve got 10 PCB so in case of a substitute I would like the same physical size.
BR
Eric
Isn't this the Digi-key link for the IRF9540 from Vishay?
IRF9540PBF Vishay Siliconix | Discrete Semiconductor Products | DigiKey
Am I missing something? Is this the wrong part?
Octopart Lists 34 distributors for these parts. Nearly everyone has them. Personally I'm grooving on Arrow's free shipping and 10% off until the end of the year, but YMMV.
Ben Franklin
NP. I frequently forget Octopart, and then kick myself when I remember.
IRF9540PBF - Vishay
- datasheet
Happy New Year!
