- Jul 27, 2020
- Reaction score
- St Albans, Herts
Regrettably when it comes to SSRs, if it's marked FOTEK then I'm afraid in my experience it is very likely to be a fake. Truth be told I have yet to receive a single SSR from any supplier on Amazon or eBay that wasn't (!)... even the ones where the photo showed a different model, when it arrived it was invariably a knock-off Fotek. So I have now given up with buying SSRs from anywhere but RS or Farnell. They do cost about £10 more, but personally I think it's a small price to pay for peace of mind. It's pretty spot the genuine (top image) from the fakes (lower image)... the give-away is normally that with the genuine parts the recess that the label fits in has a cut-off corner matching the label, whereas the fake has the cut-off corner on the label but just a plain square recess.Very nice write up and project..
another option thats a bit simpler is to buy a resistance controlled SSR, unlike the DC controlled SSRs used by pids which need a small dc voltage to turn on, these resistance controlled SSRs use a variable resistor (leky guitar volume knob/500k ohm linear pot) connected over its control terminals which lets you dial up and down the current the SSR allows through its load terminals..
add a Ã¯Â¿Â½Ã¯Â¿Â½ÃÂ£10 volt/amp meter and a box and you have a controller for Ã¯Â¿Â½Ã¯Â¿Â½ÃÂ£15-20..
SSR-40VA 40A 250V Metal Base Resistance Regulator Solid State Relay | eBay
1 5 10 20 50 100 500 K M ohm Linear Logarithmic Mono Stereo Pot Potentiometer st | eBay (500k linear 2w )
ebay links are for examples not recommended sellers, just the 1st with pics found
see Inferior Counterfeit FOTEK SSR-25 Solid State Relays on the Market - ProtoSupplies