As a retired engineering manager, the last thing I wanted to hear from one of my guys was "Interesting" or "funny" when we were in the lab. It usually meant we had a serious issue that had us headed to a product delay. Thanks for the video and i will need to get a couple of the 4556 to try out.
@dalenassar9152
Жыл бұрын
Have you heard of a company called "APED" that sold power components? I can't APEX now. They sold op amps that would put out 10's of Amps!!! I do have one of their fairly cheap PA26 dual op amp that, IIRC, can put out at least couple of amps. They even made some for driving high-current reversible motors.
@dalenassar9152
Жыл бұрын
GREAT video!! Just after watching it, I ordered a few 4556 op amps. When you put a 100 ohm resistor across 10v, that's 1 WATT of power dissipation, which means use a 5 W resistor (which will still get hot). BTW: are you swapping op amps with power ON?
@IMSAIGuy
Жыл бұрын
yes I hot swap them all the time
@EdgarsLS
Жыл бұрын
The NJM5532 does specify max output current when shorted; 32mA
@IMSAIGuy
Жыл бұрын
there is a graph of output voltage vs load resistance in the datasheet.
@bayareapianist
9 ай бұрын
I don't understand the usage of the hi current opamps. Usually there are some driving transisto'rs in power circuits which opamps can offset the gains. I've heard about some power opamps which can drive a few amps. In 80s, there were a bunch of audio amps which looked like power opamps.
This amplifier is interesting because it has zero output resistance, high output current and low price. This makes it ideal for building a simple but high-quality inexpensive headphone amplifier. However, it is already old and does not seem to be released. Are there now modern similar operational amplifiers "cheap, with zero output impedance and high output current"?
@IMSAIGuy
2 жыл бұрын
digikey has 3000 in stock: NJM4556AD
@t1d100
Жыл бұрын
Thank you.
@phuocnguyen8774
Жыл бұрын
I need more current for diy ribbon headphone? please give me your recommend
@rogerwalter2500
11 ай бұрын
Parallel these JRC4556 as unity gain with NE 5532 as a gain stage. Use 4.7 R series output resistor for joining outputs of jrc4556 together. Search objective 2 headphones amplifier by nwavguy for more information
@osmanfb1
4 жыл бұрын
what was the frequency you used? I could not see it.
@IMSAIGuy
4 жыл бұрын
1khz
@osmanfb1
4 жыл бұрын
@@IMSAIGuy so these unity gain instabilities happen at these low frequencies? I had a notion that maybe these happened at MHz levels. guessed wrong :-(
@IMSAIGuy
4 жыл бұрын
@@osmanfb1 I don't think what I was seeing was unity gain problems. I was lack of bypass capacitors and long leads and protoboard.
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