lagasse@biomed.UUCP (Robert C. Lagasse) (02/04/86)
To Larry Lipman (and anyone else interested). The LM383 works great! BUT, you have to mount the small value capacitor or capacitors, (I forget how many are used) RIGHT UP TO THE CHIP BODY, soldered where the leads enter the chip with AS SHORT LEADS as possible. The big electrolytic series capacitor is no big deal for where it is placed or wired. You also must have a power supply capable of delivering great instantaneous current (like a car battery). The audio quality is quite good and there is PLENTY of it. I ran across the same problems you did when I first tried the chip and initially brought the first one back to the store thinking I had a bad one. One other thing , I believe the chip has an automatic thermal shutdown. If it gets too hot, the chip just dies and you have to wait for a cooldown. This chip also needs a hefty chunk of metal as a heat sink, or it will shutdown within seconds of operation to protect itself. Yes.......its all coming back now. (I haven't played with this chip in a few years) Bob Lagasse @ Mass. General Hospital
fish@ihu1g.UUCP (Bob Fishell) (02/08/86)
> To Larry Lipman (and anyone else interested). The LM383 works great! BUT, > you have to mount the small value capacitor or capacitors, (I forget how > many are used) RIGHT UP TO THE CHIP BODY, soldered where the leads enter the > chip with AS SHORT LEADS as possible. The big electrolytic series capacitor > is no big deal for where it is placed or wired. You also must have a power > supply capable of delivering great instantaneous current (like a car > battery). The audio quality is quite good and there is PLENTY of it. I've had some experience with this chip, too, and I'd like to add that it is very susceptible to power supply noise, and it gets hotter than hell. Other than that, it's good for a lot of mid-fi audio applications, e.g., boosting the anemic amplifiers they put in TV sets. -- __ / \ \__/ Bob Fishell ihnp4!ihu1g!fish