SSR with BS2

Comments

• Mike Green Posts: 23,101

  2007-04-22 04:05 edited 2007-04-22 04:05

  If the signal input resistance is indeed 1K, you should be able to drive it directly from a BS2 pin. The main issue is that the input be current limited to something the BS2 can handle (roughly 20ma max.) Perhaps they have a datasheet that's more explicit about this. You can always add an additional 220 ohm resistor in series with the I/O pin to "play it safe" until you can check for sure. The minimum voltage (3V) should work.
• curious1 Posts: 104

  2007-04-23 01:04 edited 2007-04-23 01:04

  First post has·all of the info that I could find.
  
  I'll just use the 220 resistor to be safe.
  
  These are hassle free and pcb models are cheap, $12 a pop.
  
  Thanks Mike,
  
  RC
• skylight Posts: 1,915

  2007-04-23 08:45 edited 2007-04-23 08:45

  In my experience of working with several different types of SSR and measuring the current drawn at the input stage I have found that on the whole they·mostly tend to draw around the 1ma range @12v(havn't tested for 5V)·so i'm assuming several on one pin shouldn't be a problem, have you access to a current meter? Connect a battery or PS to the SSR and measure the current.
  Another useful feature i have discovered with SSR's is their ability to switch far lesser AC voltages than their rated voltage ie instead of just switching 230V ( I live in the UK) I have had them successfully switching voltages as low as 12VAC.
  One more feature is that they can also switch a dimmed mains input useful for setting a preset level of lighting and switching this on and off (used in my work).
• curious1 Posts: 104

  2007-04-23 09:37 edited 2007-04-23 09:37

  Thanks skylight,
  A GOOD meter is on my wish list.
  I will only have 1 relay per pin, 4 total.
  RC