good morning everyone how are you?
I take advantage of your patience and courtesy again:
the point is that i have a problem with the ic tda7293.
i tried to build an amplifier several times but it never works.
I am using some pcb boards already made, and with different configurations, but it never works for me.
I read on the web
and also on the forum, that this i.c. has mute and stand by controls that should be excluded to make it work, I tried to follow the instructions, but it doesn't work anyway. can you help me understand why it doesn't work?
on the same pcb I mounted some tda7296 and they work perfectly, but the tda7293 no.
thanks for your attention.
I take advantage of your patience and courtesy again:
the point is that i have a problem with the ic tda7293.
i tried to build an amplifier several times but it never works.
I am using some pcb boards already made, and with different configurations, but it never works for me.
I read on the web
and also on the forum, that this i.c. has mute and stand by controls that should be excluded to make it work, I tried to follow the instructions, but it doesn't work anyway. can you help me understand why it doesn't work?
on the same pcb I mounted some tda7296 and they work perfectly, but the tda7293 no.
thanks for your attention.
Mute and standby have components connected, look them up in the datasheet.
Looks like they go to ground for normal use.
Looks like they go to ground for normal use.
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with one of the PCBs when I turn on it makes a light hum, in the other 2 absolute silence, and they not amplify.
Depends where you got the pcb from.
If you got it from ebay check sellers feedback for problems with same pcb.
Might be worth tracing out the pcb and comparing it to datasheet circuit.
Could be a bad solder joint, a good visual check is a good start.
What power supply are you using ?
Standby and mute should both be grounded.
If you got it from ebay check sellers feedback for problems with same pcb.
Might be worth tracing out the pcb and comparing it to datasheet circuit.
Could be a bad solder joint, a good visual check is a good start.
What power supply are you using ?
Standby and mute should both be grounded.
have you already had any experience, or heard of pcbs not working?
sure in my case it is 5 pcb not working, it seems a bit strange to me, don't you think?
sure in my case it is 5 pcb not working, it seems a bit strange to me, don't you think?
Are you using split rails from your power supply ?
You mentioned 50 volt rail.
It should be +25 volts, ground connection then -25 volts rail.
So you need either a dual transformer secondaries or a centre tapped transformer.
You mentioned 50 volt rail.
It should be +25 volts, ground connection then -25 volts rail.
So you need either a dual transformer secondaries or a centre tapped transformer.