Frequency of NE602. - Electronic Circuits Projects Diagrams Free

Dawny · 26th October 2007, 03:18 AM

Hello.

I finally got my NE602’s the other day, ok so they turned out to be SA612’s but I’m not complaining because they seem to work the same. My question is after tinkering with these chips and building some radios with them I realized they come with a built in oscillator so there for I should be able to use a frequency meter (or what ever you call them in your part of the world) to read the frequency that the SA612 is working at?

Am I right in my assumption and if I am, how would I do this?

Dawn.

P.S. I figure seeing the basis for all NE602 / SA602 or SA612 circuits are the same someone might be able to answer this without me needing to draw up the circuit of what I’m using but if that’s not the case just ask me and I’ll post it.

Thanks in advance.

kchriste · 26th October 2007, 04:15 AM

You would use a buffer on pin 7 of the SA612. They show typical buffer circuits in figure 8 of the datasheet. You would connect your frequency counter to the point labeled "to synthesizer".
Datasheet:
http://www.datasheets.org.uk/pdf/2993892.pdf

Dawny · 26th October 2007, 12:23 PM

I tried the idea in the datasheet and it didn't work... I wonder if there is something wrong with my circuit.

Dawn.

kchriste · 27th October 2007, 02:00 AM

Did the frequency counter read zero or did it read out a number you didn't expect? Try measuring the levels with a RF probe or a scope if you have one that works at those frequencies.

Dawny · 30th October 2007, 04:03 AM

frequency counter read zero... And at the moment I don't own a scope, I was looking into buying one but all I can find in my price range is a 10khz one.

kchriste · 30th October 2007, 04:38 AM

Quote:

Originally Posted by Dawny

P.S. I figure seeing the basis for all NE602 / SA602 or SA612 circuits are the same someone might be able to answer this without me needing to draw up the circuit of what I’m using but if that’s not the case just ask me and I’ll post it.

Now would be a good time to post a schematic of your circuit.

mvs sarma · 30th October 2007, 07:49 AM

Dawny may not be able to connect a frequency counter directly, -- she should pick up signal on pin7 of the device witha 1KpF capacitor, wireup a 2n2222 or BF495 as a common emitter amplifier- take output at the collector and try to measure with a Frequency counter.

ONce she is sure of the range of the oscillator with say L-C combination and the coil and Trimmer cap are adjusted, she can use normal pointer radio method -- Frequency counter is not a must.

She should appreciate as to how earlier radio biulders have tuned and calibrated their rados across a pointer scale. I do agree a freqiency counter facilitates very much.
Now a days, one could salvage a digital radio like Kchibo KK939B sold very cheap. recover the counter from there and use it with suitable protection-as otherwise the front end burns off. this counter works at very low DC voltages. Datasheets for the COB used there in are downloadable.

Ps:modified after seeing Dawny's reply!

Dawny · 2nd November 2007, 06:21 AM

She, I'm a she.

**Nigel Goodwin** · 2nd November 2007, 10:34 AM

Quote:

Originally Posted by Dawny

She, I'm a she.

It's alright, we won't hold it against you!

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26th October 2007, 03:18 AM	(permalink)
Dawny	Frequency of NE602. Hello. I finally got my NE602’s the other day, ok so they turned out to be SA612’s but I’m not complaining because they seem to work the same. My question is after tinkering with these chips and building some radios with them I realized they come with a built in oscillator so there for I should be able to use a frequency meter (or what ever you call them in your part of the world) to read the frequency that the SA612 is working at? Am I right in my assumption and if I am, how would I do this? Dawn. P.S. I figure seeing the basis for all NE602 / SA602 or SA612 circuits are the same someone might be able to answer this without me needing to draw up the circuit of what I’m using but if that’s not the case just ask me and I’ll post it. Thanks in advance.

26th October 2007, 04:15 AM	(permalink)
kchriste	You would use a buffer on pin 7 of the SA612. They show typical buffer circuits in figure 8 of the datasheet. You would connect your frequency counter to the point labeled "to synthesizer". Datasheet: http://www.datasheets.org.uk/pdf/2993892.pdf __________________ --- The days of the digital watch are numbered. ---

26th October 2007, 12:23 PM	(permalink)
Dawny	I tried the idea in the datasheet and it didn't work... I wonder if there is something wrong with my circuit. Dawn.

27th October 2007, 02:00 AM	(permalink)
kchriste	Did the frequency counter read zero or did it read out a number you didn't expect? Try measuring the levels with a RF probe or a scope if you have one that works at those frequencies. __________________ --- The days of the digital watch are numbered. ---

30th October 2007, 04:03 AM	(permalink)
Dawny	frequency counter read zero... And at the moment I don't own a scope, I was looking into buying one but all I can find in my price range is a 10khz one.

30th October 2007, 07:49 AM	(permalink)
mvs sarma	Dawny may not be able to connect a frequency counter directly, -- she should pick up signal on pin7 of the device witha 1KpF capacitor, wireup a 2n2222 or BF495 as a common emitter amplifier- take output at the collector and try to measure with a Frequency counter. ONce she is sure of the range of the oscillator with say L-C combination and the coil and Trimmer cap are adjusted, she can use normal pointer radio method -- Frequency counter is not a must. She should appreciate as to how earlier radio biulders have tuned and calibrated their rados across a pointer scale. I do agree a freqiency counter facilitates very much. Now a days, one could salvage a digital radio like Kchibo KK939B sold very cheap. recover the counter from there and use it with suitable protection-as otherwise the front end burns off. this counter works at very low DC voltages. Datasheets for the COB used there in are downloadable. Ps:modified after seeing Dawny's reply! __________________ Regards, Sarma. Last edited by mvs sarma; 2nd November 2007 at 12:10 PM.

2nd November 2007, 06:21 AM	(permalink)
Dawny	She, I'm a she.