hate the point to point boards used them plenty of times. maybe i should try an tag strip?
Whatever works for you, long as your having fun 👍
Tubes are a different beast though, things get unexpectedly expensive very quickly! I'm working on a tube preamp right now.
Tubes are a different beast though, things get unexpectedly expensive very quickly! I'm working on a tube preamp right now.
i should build a nice source device, an dac with an volume knob (and an galvanically isolated usb port)
Did you ever build a prototype of this? I'm experimenting with a slight variation of it in LTSpice and it looks really promising!
Try (looking at) the Dolby SR prototype (courtesy Wikipedia), now that's the spirit of perfboard prototyping !!
I just tried it with a modest NE5532 and it performs like a champ. Sadly, I don't have any BD911/912, otherwise I would have build one on perfboard this weekend. Maybe I have something similar sitting around. THD at 0.0005% isn't bad for such a simple little thing.
My dad was analog IC designer. I remember visiting his job back in the 80s and his bench looked exactly like that. He had the whole frontend of a carrier phone exchange built on perfboard.
Actually... I have a whole bunch of old Sanken MN2488/MP1620 in my junk box. They might work for a quick test. If I have nothing better to do, I'll build this puppy for fun.
Be careful with this. NE5532 have max. +/-22V supply voltage. Those BD911/912 seems to be well available here .... could be interesting later.
I'll probably run in on +-18V. I just noticed my sim had +-24V. Yeah, that would have been an issue. 🙂
Me too, i rarely pay close atention to the exact transistor model, i wanted to use the mje3055/2955.
This is what a prototype is supposed to look like. A total mess. 😀
So, not surprisingly, you design works. At least it amplifies a signal at >0.1% THD (probably much less) without letting out the magic smoke. So far so good. A few more sanity checks and then we’ll see how it does driving a speaker!
So, not surprisingly, you design works. At least it amplifies a signal at >0.1% THD (probably much less) without letting out the magic smoke. So far so good. A few more sanity checks and then we’ll see how it does driving a speaker!
Attachments
I declare my Sunday experiment concluded. It plays music and actually sounds quite nice. I'm using a NE5532 and a 47p Miller capacitance. could probably get away with less. It might be fun to try a few other opamps, such as the TL072 and LM4562 that I have laying around. The output transistors are TIP35/36 which aren't exactly known to be great audio devices, but it works fine. Such a high power transistor is overkill for the first stage. Maybe a BD911/912 instead?
I'm running it at +-18V and it pulls just about 2W at idle and barely gets warm. The bias current spikes for a few seconds after power on, but settles nicely.
I might build one for my patio speakers, but I'll probably add some overcurrent protection and reverse polarity protection.
Overall a neat little amplifier! Thank for posting @No ideas
I'm running it at +-18V and it pulls just about 2W at idle and barely gets warm. The bias current spikes for a few seconds after power on, but settles nicely.
I might build one for my patio speakers, but I'll probably add some overcurrent protection and reverse polarity protection.
Overall a neat little amplifier! Thank for posting @No ideas