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  • As for the LNA, maybe an existing design can be adapted to a circular circuit board similar to the original, and the design could be uploaded to oshpark so that anyone can order the circuit board from them and the components from a normal electronics supplier and assemble at home? The SPF5189Z seems easy enough to implement and you could probably make workable layout where it is the only surface mount component, for easy home assembly.

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  • This seems to be a product that is only available in the UK? At any rate, if you have a good digital scale you can mix a similar (possibly identical) solution at home. to 100ml of distilled water add 0.5g of stannous chloride, 2g of thiourea, and 3g of sulfamic acid. I recently purchased 1oz of stannous chloride, 2oz of thiourea, and 3oz of sulfamic acid from a single vendor on ebay for less than $30 shipped. Far cheaper, in the long run, than the pre-mixed stuff. Enough to mix up several litres. But the shelf life is not too good, so it makes more sense to make it a little at a time. None of these chemicals are controlled in the USA but it should be noted that thiourea is a bit toxic. Acute toxicity at these quantities is pretty unlikely but you should take proper precautions and familia‚Ķ

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    This seems to be a product that is only available in the UK? At any rate, if you have a good digital scale you can mix a similar (possibly identical) solution at home. to 100ml of distilled water add 0.5g of stannous chloride, 2g of thiourea, and 3g of sulfamic acid. I recently purchased 1oz of stannous chloride, 2oz of thiourea, and 3oz of sulfamic acid from a single vendor on ebay for less than $30 shipped. Far cheaper, in the long run, than the pre-mixed stuff. Enough to mix up several litres. But the shelf life is not too good, so it makes more sense to make it a little at a time. None of these chemicals are controlled in the USA but it should be noted that thiourea is a bit toxic. Acute toxicity at these quantities is pretty unlikely but you should take proper precautions and familiarize yourself with the safety data sheet all the same. My chemist friend advises me that the thiourea and sulfamic acid will slowly react with each other even while dry if mixed. They will also slowly oxidize over time. For long term storage he recommended keeping each chemical in the original container, inside a zippered baggie with an oxygen absorber, inside a pint paint can.

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