Hi peeps, I'm trying to build an amp based off a schematic found online, which uses TL072, BA4560, and a TDA2030A. However, only the TDA2030 IC has power input drawn. On the TL072 and BA4560 chips, simply no power leads are drawn above/below the transistor triangles. Do these chips even work without VCC and VEE? thanks

 

Hello,

All chips do need power.
Without the power they will not work.
Often the powerlines are not shown in the schematics.

Bertus

 

Hi peeps, I'm trying to build an amp based off a schematic found online, which uses TL072, BA4560, and a TDA2030A. However, only the TDA2030 IC has power input drawn. On the TL072 and BA4560 chips, simply no power leads are drawn above/below the transistor triangles. Do these chips even work without VCC and VEE? thanks

No such luck. There's no free lunch here.
Sometimes folks leave out the power connections in their drawings. These are taken for granted. They also leave out the power supply decoupling capacitors. These are essential in your real circuit.

 

Alright, thanks guys!

 

On the TL072 and BA4560 chips, simply no power leads are drawn ...

Those are both op-amps and require power. I think it's a fair assumption that they are intended to get the same power as the IC that is connected. If a different power was necessary, it would make sense to include that information on the schematic.

 

When in doubt, look at the data sheet for the IC.

 

Please post your schematic so we can see what you see.

ak

 

Hello,

All chips do need power.
Without the power they will not work.
Often the powerlines are not shown in the schematics.

Bertus

The emergence of energy harvesting devices broadens the amount of interpretations that question is open to.

The best answer for the TS's question is that most op-amp and logic drawings leave out the power line indications to avoid a cluttered schematic.

 

Do these chips even work without VCC and VEE?

Nope. Never.

 

Nope. Never.

CMOS gates will power up from voltages applied to the inputs of gates. Current from input signals conduct through the input protection diodes and can supply the Vdd power plane since the current requirements are in microamps.

 

CMOS gates will power up from voltages applied to the inputs of gates. Current from input signals conduct through the input protection diodes and can supply the Vdd power plane since the current requirements are in microamps.

I think it's pretty clear in my post that I was replying to the OP's notion of "these"...

Powering up CMOS through their outputs or overdriving their inputs are issues that are common knowledge and thoroughly documented.

 

I think it's pretty clear in my post that I was replying to the OP's notion of "these"...

Powering up CMOS through their outputs or overdriving their inputs are issues that are common knowledge and thoroughly documented.

I'm just making sure that newbies are familiar with these nuances.