I built the double balanced Tayloe with the TI 3253 that words very well. The
INA163s gain is X10 since my unit hangs off a 455 KHz IF. I put a 6 dB pad on
the input to force 50 ohms.
This feeds my HPSDR set up in the low gain setting. The HPSDR in high gain
mode requires lower op amp gain and high quality cable as an interface. It is
very sensitive in the high gain mode but flatter frequency response.
BTW a soft rock 6 kit would have been a lot cheaper to do. frank
Andreas Troschka <[EMAIL PROTECTED]> wrote:
jr_dakota wrote:
> A couple of pin for pin replacements are CBT3253 and FST3253 ... other
> numbers are SN74CBT3253 or 74CBT3253 or 74FST3253
>
> All are essentially the same chip just different manufacturers ... The
> FST is Fairchild (USA) and the CBT is Philips (EU, Netherlands)... In
> your part of the world the Philips device may be the easiest to obtain
>
> JR
>
> --- In soft_radio@yahoogroups.com, "Adnan Yusuf" <[EMAIL PROTECTED]> wrote:
>> i was making the sdr for the masses circuit. Unfortuately i couldnt
>> get the IC pi3b3253. However i got another ic named 74hc4052. The
>> problem that i am now having is that although both the ic's are
>> mux/demuxers with almost the same pins there are two pins that are
>> different in both the ics
>>
>> the pi3b3253 has 2 enables(one for high and one for low)
>> the 74hc4052 doesnt have this
>>
>> the 74hc4052 has a Vee pin while the pi3b3253 doesnot have this pin.
>> will i still be able to use this ic as an equivalent.
>>
>> please look at the link which provides the picture, it will make the
>> situation very clear.
>> http://img509.imageshack.us/my.php?image=67751722pt1.png
>>
>> please do reply. please take your time. i would be very greatful.
>>
>> yours
>> adnan yusuf
>>
>
I'll underline that the mentioned pi3b3253 is a LVT (Low Voltage Technology)
device working at 3.3Vcc with consequent logic voltage levels, differently from
some other devices wrongly indicated on this thread as equivalents.
A direct substitution of such device with the indicated components can't be
made without adaptation in the surrounding circuit.
I don't know the device family used in the Tayloe circuit the 3253 is placed in
(a pi5b3253, a 5Vcc level device exists too), of the receiver you mentioned, so
it's up to you to verify this aspect and select the proper replacement.
vy 73s de ik2wqi
Andreas Troschka
