What is a SSR?
SSR Stands for Solid State Relay. It uses a low volt input from a controller to switch a high voltage on and off.
There are two types of SSRs, AC SSRs and DC SSRs. As all of my Christmas lights are AC powered - 240VAC or 24 VAC (transformers) I use the AC SSR variety.
Here is a basic diagram showing the application.
The Naked SSR | Tools you will need.
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Parts List
These are codes and prices in NZ prices from Active components. Also search on EBay, and it you don't mind waiting for delivery, deals can be found.
The boards themselves are from a number of third party sources, contact me for details.
| Code | Amount | Description | Price |
| 5520243-4 | 1 | Modular Jacks 8/8 SIDE ENTRY | $2.87 |
| 538-39890-0302 | 1 | Eurostyle Terminal Blocks 5.0MM ECONOMY 2P | $1.22 |
| 538-39890-0303 | 1 | Eurostyle Terminal Blocks 5.0MM ECONOMY 3P | $2.00 |
| 571-1-390261-1 | 4 | IC Sockets 6P ECONOMY TIN | $0.23e |
| BTA08-400BRG | 4 | Thyristors - Diacs, Sidacs, SCRs & Triacs 8 Amp 400 Volt | $1.95e |
| MOC3023 | 4 | Triac & SCR Output Optocouplers Optocoupler TRIAC | $0.75e |
| 4 | 1/4Watt Axial Leaded Carbon Film Resistors 360ohms 5% | $0.55 | |
| 4 | 1/4Watt Axial Leaded Carbon Film Resistors 680ohms 5% | $0.55 | |
| 441-R324-GR | 1 | Fuse Holders PC MOUNT BLACK | $1.87 |
| 504-GMC-5 | 1 | 5mm x 20mm Medium Time Delay Fuses 125VAC, 5A Med Time Delay | $2.44 |
| L-53SRC/C | 1 | 5mm Led any colour you like | $0.13 |
| Approximate total | $26.65 |
 | Right - The construction of the board itself is pretty much easy. The board comes printed and shows you where to solder the bits. In the next part we will connect the SSR to the power board. |
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