Alternate IC

[Macka]

Hi,

I'm going to attempt the circuit at this website... https://www.redcircuits.com/Page78.htm
but i am unable to find the required IC (TDA7052), its an Audio Power Amplifier.

Does anyone know of a replacement i can use? (i plan on running this on a 9v battery)

Thankyou in advance.

 

[Dr.EM]

Not quite a pin-for-pin replacement, but a LM386 should give enough volume and works off low voltage supply.

 

[raybo]

Because of china you can buy 3 stations intercom for $50.00 wireless why mess with this except the chalenge

 

[Macka]

Im after a "$2" intercom system (hopefully more then 2 stations, aiming for 4) for the school musical, as we are stuck with these dodgey headset walkie-talkies for ages 7 and up (they have poor reception and it very hard to understand what the stage manager is saying).

Being on sound, i want to be able to communicate with the other half of our crew (backstage mic-ing people) but currently have to relay a message via stage management with the dodgey walkie talkies mentioned above. I dont only want to communicate with the rest of the sound team but with lighting and Stage management.

- thats my reason for wanting to mess around making one (also the budget is almost gone)

 

[Dr.EM]

Yep, the LM386 is good and cheap. You intend to drive speakers or headphones? It can do either, but the speaker output could be a bit quiet if used in a loud environment, overdriving it a little will make it sound louder, but obviously distorted. Try to get the LM386-3 or LM386-4 models, the -1 and -2 are lower power, though for headphones will be ample.

 

[Macka]

Definately headphones, cant use speakers backstage and as you said it would be too quiet

 

[raybo]

A 9 volts battery forget it except if you own a battery store. At least buy some 100 ohms speakers and there goes your $2.00 badget. Dream the impossible dream. But the lm386 is a good choise for 1w amp and cheap. but remenber 1w amp

 

[Nigel Goodwin]

I used LM380's back in the 1970's for a band mixer I built, they worked fine for PFL, it doesn't take much to feed headphones - an LM386 would be fine, and provide be capable of more power than you need.

 

[raybo]

there you go use headphones for intercom. just make sure everybody is wired up.