you can use a transistor but it has to handle AC and you will find that the BJT interferes with the quality of the signal when the mute is OFF.
jFETs can be used, but again take care with parasitics affecting audio quality.
A signal relay is probably easiest and possibly has the lowest parasitics when in the OFF position.
You can use this mute for delayed turn on and for instant off in fault condition.
jFETs can be used, but again take care with parasitics affecting audio quality.
A signal relay is probably easiest and possibly has the lowest parasitics when in the OFF position.
You can use this mute for delayed turn on and for instant off in fault condition.
just built two of these and both have the same fault distortion on one channel only
built two last year no probs
using 15/0/15 supply
not many components all in right place
checked against photos etc
any ideas anyone?
built two last year no probs
using 15/0/15 supply
not many components all in right place
checked against photos etc
any ideas anyone?
oh and the distortion is immediate so presume not spike protection
tthe distortion has a worbling squeak at tweeter frequencies
tthe distortion has a worbling squeak at tweeter frequencies
^ You might post pictures of the build, and take DC measurements of the +/- power rails and AC measurement of the input signal at the chip pins while the input signal is a continuous tone on both channels and you're hearing the distortion.
However if the distortion is bad I wouldn't subject good speakers to it for long in case they would be damaged.
However if the distortion is bad I wouldn't subject good speakers to it for long in case they would be damaged.
my meter died recently so will need a new one to get any further
might try another transformer as well
might try another transformer as well
The chip itself is wonderful!
But you know what?
I bought this : HF LM4766 NE5532 40W 40W Stereo Amplifier Board 4 | eBay
Possibly the worst PCB design ive ever seen...
The supply rails are longer than my used socks, no HF filtering near chip only near the large filter caps...
It heated up so badly that it blew up after killing it at 8 ohms with supply voltage +-30V non regulated.
If you are about to buy this board, do not! It takes alot work to make it sound good.
But you know what?
I bought this : HF LM4766 NE5532 40W 40W Stereo Amplifier Board 4 | eBay
Possibly the worst PCB design ive ever seen...
The supply rails are longer than my used socks, no HF filtering near chip only near the large filter caps...
It heated up so badly that it blew up after killing it at 8 ohms with supply voltage +-30V non regulated.
If you are about to buy this board, do not! It takes alot work to make it sound good.
Yes, the use of this chip design very much.
Them some good. Some is very poor.
In some cases, higher prices and more beautiful appearance, does not make sound better. Maybe even worse.
There is currently no NE5532 + LM4766 design. I estimate that there will be no later.
I recently installed one. Probably the cheapest machine I've ever installed.
LM4766
I found a computer speaker that nobody wanted. There is a transformer inside.
AC 18-0-18。 Then I found a previously abandoned chassis.
The total cost will not exceed $12.
LM4766
I found a computer speaker that nobody wanted. There is a transformer inside.
AC 18-0-18。 Then I found a previously abandoned chassis.
The total cost will not exceed $12.
