> 22 Jun 2011 08:29:02 +0100 Michael Watterson wrote:
=20
> I have a number of ex-TV and VCR Analogue Tuners, most with pin to=20
> switch UHF, Band III and Band I. You can have one for cost of postage=20
> from Ireland.

Thank you for your offer, I looked at the postage rates from Ireland to=20
South Africa -http://www.anpost.ie/AnPost/PostalRates/Standard+Post.htm.
Standard rates for a Packet of 250g is Euro3.5 [okay] and parcel is=20
Euro 22 - which is out. I don't know how a parcel and packet gets defined.

Further searches revealed http://www.pollin.de have a set of 10 tuners
at Euro4.95 + (international postage). The catch is that there is no=20
circuit diagrams or paypal. http://www.mtmscientific.com/tuner.html
has a couple of projects (with DS for tuner) , for $19.50. This includes
a RF Spectrum analyzer which is an option for the other recent thread
{EE] Build a spectrum analyzer}.

Before your offer I made a bid on a local auction site for a TV tuner=20
card in the hope of landing a FM1216. I did not, but the TNF9535 tuner
internals reveal a SN761672A IC from TI ( has datasheet and samples).
This is an older device - SN761677A tuner card is on Youtube, but I=20
managed to find the TNF9535 datasheet on the web as well.

The datasheet is sufficient to use the device, the tuner has a video
demodulator and CVBS can be tapped out to test OTA TV. I will have to
tap the IF past the SAW filter, but there is enough info it available
to get going.

> The pinouts are fairly standard. There is AFC, AGC, +12V or=20
> +9V Power,=20
> Band Pins, Tuner volts up to 30V, IF out. You can short AFC=20
> to ground or=20
> open circuit depending on model and put a pot on AGC pin for RF gain.=20
> Sometimes marked on can. Removal of cover and test with meter usually=20
> reveals which pin is which.
>=20
I have a couple of pulls of these in by junk box, but I did not mark=20
them out before desoldering :-( Part of the context of my thread is=20
digitally controlled analog tuners, as opposed to voltage controlled
tuners. Then there is digital tuners for DTV.

--=20
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