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Flashing Lamps Circuit: 230V AC with SCR Timing
Circuit Diagram
This circuit is designed as a dependable substitute for heat-activated switches utilized for creating animated effects in Christmas tree light displays. The configuration involving transistors Q1, Q2 and associated resistors activates the SCR. Timing control is achieved through resistors R1, R2 and capacitor C1. Adjusting flashing frequency necessitates altering the value of C1, rather than modifying R1 and R2 values; consider changing C1's value from 100 to 2200µF instead.
Optimal performance is generally observed with C1 valued at 470 or 1000µF and R4 set to 12K or 10K. Due to the minimal power consumption of typical Christmas tree lamp series circuits (60mA at 230V is customary for a 20-lamp series loop), compact and affordable SCR components can be utilized, such as C106D1 (400V, 3.2A) or TICP106D (400V, 2A). These latter devices, along with the suggested P0102D device, feature a TO92 package.
Parts:
- R1 = 100K
- R2 = 1K
- R3 = 470R
- R4 = 12K
- R5 = 1K
- R6 = 470R
- Q1 = BC327
- Q2 = BC337
- D1 = 1N4007
- D2 = 1N4007
- D3 = 1N4007
- D4 = 1N4007
- D5 = P0102D (SCR)
- C1 = 1KµF-25V
- PL1 = Male Mains plug
- SK1 = Female Mains socket
Important Note:
Proper operation absolutely requires the use of high Gate-sensitive SCRs. Should these devices be unavailable, Triacs can be utilized instead. This circuit will function effectively even with more robust devices in such a case. A recommended Triac is the commonly used TIC206M (600V, 4A), although many other types will operate successfully. Please note that, irrespective of the Triac, the diode bridge D1-D4 remains necessary.
Warning! The device is connected to 230Vac mains, thus some components within the circuit board are subjected to a potentially lethal voltage! Avoid contact with the circuit when plugged in and enclose it within a plastic case.