Here in the land of opportunity a DIY PA rig either for manufacturing or actual road use has near zero chance of becoming commercially successful. Those of us building iron horse amplifiers or running DIY PA rigs have something else that pays the bills. To get into the business, as a business you’re expected to go to the bank with a business plan and get a loan for three quarters of a million dollars, then buy everything, hire employees, take out insurance. And then see if you make it. If your business is building the PA gear instead of running it, youd be using contract manufacturing in China. In either case it turns doing something you really enjoy into a big HASSLE.
Hi everyone, I have learned a little bit about Current Mirror and watched some tutorials on Youtube on my vacation. After the vacation, I was busy with some office stuff. Any way, in the mean time, one of my friends requested me to build an amplifier for him, and I am quite a bit anxious because he is a vinyl guy and he uses quite expensive devices like Onkyo TX SV919 THX [Linited Edition] and lots of stuff that I can't imagine in my dream.
His requirements are stereo 4 channels [Left A/B and Right A/B ] Amp and Blanched & Unblanched input facilities. I have attached the schematic. Please comment on that; what I did wrong this time!? Do I really need to use the VI Limitter?
His requirements are stereo 4 channels [Left A/B and Right A/B ] Amp and Blanched & Unblanched input facilities. I have attached the schematic. Please comment on that; what I did wrong this time!? Do I really need to use the VI Limitter?
Attachments
Current mirrors do not work there without a specific treatment to force the desired current in the VAS. That’s the Randy Slone mistake. I know, it simulates fine like it is but wont work. There is a way to fix it, but I don’t recall it off the top of my head.
You always need VI limiters, unless you want to go looking for trouble.
You always need VI limiters, unless you want to go looking for trouble.
Beware! Can you afford to invest 100,000 Taka and months of hard work in an amplifier that your friend rejects because it fails, and refuses to pay for? Taking responsibility for a complicated product is something only a corporation can afford and has the resources to design and test successfully. Realize that all the cheap alternatives are selling "as-is" without any warranty, and therefore can make over optimistic claims.