help me to understand this

[imgemini]

hi friend

this criciut is for sine wave genrator using the IC called NC-1458 which have 8 pin's but criciut seing 4 is he using one IC ?.... after design from where we know it,s genrating sine ware

 

[ChrisP]

The MC1458 is a dual op-amp. Pin assignments are as follows:

Pin 1 - Output A
Pin 2 - Inverting Input A
Pin 3 - Non-inverting Input A
Pin 4 - V(ee)
Pin 5 - Non-inverting Input B
Pin 6 - Inverting Input B
Pin 7 - Output B
Pin 8 - V(cc)

 

[ChrisP]

BTW -- Motorola MC1458 Datasheet

 

[magickaldan]

The chip has two op-amps so he is using only one chip thats how schematics are drawn. So yes only one chip is used.

 

[imgemini]

thx,s but

hi friend
can u plz help me to understand from where i can get output sine wave . any way i can know in which frequency it is working on


:!:

 

[kurtjo]

You will get a square wave from pin 1 and a sawtooth from pin 7.
The frequency will be roughly between 100 and 1kHz. No sine wave.
:?

 

[imgemini]

thxs

thx,s friends u just slove my problem i guess :lol:

 

[imgemini]

hi

what is meaning by 10 a 12 a here in cricuit plz

 

[Optikon]

Re: hi

what is meaning by 10 a 12 a here in cricuit plz

Well, obviously they are the same node and it is very poor practice to give the same node more than one name, so I might assume that really there is a physical connection point there like a connector or some other means or physical connect-disconnect. If this is the case, it is also poorly drawn because they are not drawn properly..

 

[imgemini]

hi

hi
this ad-resistor the GND and the out both are connected together .

 

[Nigel Goodwin]

Re: hi

hi
this ad-resistor the GND and the out both are connected together .

It's simply wired as an adjustable resistor, giving just two connections. When they are wired using three connections (like a volume control) it's called a potentiometer.

 

[imgemini]

hi

plesae tell me what is the name of this part


is this Varactor diod or swtch diod ...or what .and plesae see the circuit above bcoz making any statement :arrow:

 

[imgemini]

as picture shows


10a & 12a closed ... 10c & 14c opened ----> square wave

10a & 12a closed ... 10c & 14c closed ----> sawtooth

 

[imgemini]

and from where i get the output for square wave and sq wave