build twin loop teasure seeker

[serafin]

I am building the twin loop teasure s. but non encounter the IC A709cp. my question is... That replacement I can use to replace this IC?

Help me. Please!!

Thanks.

[Esteban Cabrera Grinok]

Re: build twin loop teasure seeker

Any kind of 709 work. You can replace this by the LM318 with the necessary modifications.

I replace the normal TIP 31 by TIP 112 or TIP 122 darlington transistors. I hope the pinpoint version coil is better.

[Serafin]

Re: build twin loop teasure seeker for

Of which type of modifications I must do?

for replace 709 for lm318

[Reg]

Re: build twin loop teasure seeker

Hi,

You might try an NE 5534 first without making any changes and see what happens. It just might work. If it doesn't, it shouldn't take too much to make it work.

Example, you might have to reduce the value of R 16 from 390K down to maybe 100K if you cannot balance the output of the opamp.

Reg

[Norbert]

Re: build twin loop teasure seeker

Why don't you use the LM709 from National Sem.

Greetings from Austria!
Norbert



LM709

[Serafin]

Re: thanks best regards

gracias a todos