Switchback DRL w/POD light turn indicators sync'd
Here is the circuit for Switchback DRL function that blinks the POD light(s) in sync with the turn indicators....
It's inexpensive to make and none of the components are used to anywhere near their potential power rating. In addition, the components are rated to over 100°C so if you make it water tight and assemble it properly, it should work and last a long time. Relay is a Normally Closed (NC) DPDT 2 Amp board mount. This one is polarity sensitive so connect it as shown or it will not switch.
Timing using components listed is right at 1 second from the rising pulse of turn indicator going high +12 which disables DRL until DRL switchback. Because not all Solid State blinker relays are the same timing this is pretty safe time delay wise as it will stay off a hair longer than falling edge of turn indicator.
Once the components are laid out as shown this is a quick build as most of the connections can be made in a straight or 90° angle.
The running light supply power DRL LED, POD light LED and the circuit timing. It draws a fraction of the current the original incandescent bulb drew so powering a both the DRL (0.1 A & POD light 0.1 A) are completely safe using the OEM supply.
NOTE: ** Build and implement at your own risk. ** I am not responsible for errors or omissions!
This has not been tested long term, but it is solid and as said, nothing is being taxed power wise. The blinker power is a pass-thru. If the circuit fails the odds of loosing the blinker output are very very small. The DRL goes through a normally closed relay. If the circuit fails, the relay will continue to operate the DRL.
The pod light is limited to a max of 1amp through D3.... When indicator is off, pod light power is through the NC relay. When the indicator is active, the relay is open and pod power is through turn indicator supply and into D3 which goes to pod light output.
Last little bit, if you use this or build it, please give credit as to where it came from. Thanks!
Schematic:
Timing:
PCBA layout:
Back:
Red = DRL in. This charges cap and operates timing circuit.
Black = GND for circuit timing and pass thru for DRL and Turn indicator.
Green = Turn indicator - pass thru.
Yellow = Switchback DRL into and out of DPDT relay.
Orange = POD Light. Out of DPDT relay. Omit D3 and output if not used.
Components used & source: Note builds L & R circuit's...
D1, D2
Quantity: 4 @ $0.06 ea
Mouser #: 512-1N4148,
Mfr. #: 1N4148
Desc.: Diodes - General Purpose, Power, Switching Diodes - General Purpose, Power, Switching 100V Io/200mA BULK
D3
Quantity: 2 @ $0.16 ea
Mouser #: 512-1N4004
Mfr. #: 1N4004
Desc.: Rectifiers Rectifiers Vr/400V Io/1A T/R
R1
Quantity: 2 @ $0.15
Mouser Part #: 660-CF1/4C103J
Manufacturer Part #:CF1/4C103J
Manufacturer: KOA Speer
Description: Carbon Film Resistors - Through Hole 10Kohms 5%
R2
Quantity: 2 @ $0.15
Mouser Part #: 660-CFS1/4CT52R220J
Manufacturer Part #: CFS1/4CT52R220J
Carbon Film Resistors - Through Hole 22 OHM 5% 1/4W
Q1
Quantity: 2 @ $0.17
Mouser #: 512-2N3904BU
Mfr. #: 2N3904BU
Desc.: Bipolar Transistors - BJT Bipolar Transistors - BJT NPN Transistor General Purpose
RY1
Quantity: 2 @ $3.47
Mouser #: 655-3-1462039-8
Mfr. #: 3-1462039-8
Desc.: Low Signal Relays - PCB Low Signal Relays - PCB IM06DTS=IM RELAY 140MW 12V
These are 2Amp / 30 volt contacts, 1000 ohm coils
C1
Quantity: 2 @ $0.23
Mouser #: 647-USV1E100MFD
Mfr. #: USV1E100MFD
Desc.: Aluminum Electrolytic Capacitors - Leaded Aluminum Electrolytic Capacitors - Leaded 25volts 10uF 5x7 20% 2LS
Switchback time:
Min:Sec.100th/sec
00:00.40 sec delay - 4.7uF
00:00.85 sec delay - 10uF **
00:01.20 sec delay - 15uF
00:01.62 sec delay - 25uF
00:03.69 sec delay - 100uF
00:07 sec delay - 220uF
Note: Adding R2 between Q1 Emitter and Ground increases these times by about 20%
PCB
Lead time is long on the 2X8cm, but these were $14 for 30 parts
30 Pcs Double Sided PCB Board Prototype Kit for DIY, 4 Sizes by Paxcoo
https://www.amazon.com/gp/product/B01N3161JP/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
2X8cM and 3X7CM
Kalevel� 5pcs FR-4 Glass Fiber Double Sided Prototype Pcb Universal Printed Circuit Board (3*7cm)
https://www.amazon.com/Kalevel-Prot...words=PRINTED+CIRCUIT+PROTOTYPING+BOARDS&th=1
[video=youtube_share;H8ypOztW3qA]https://youtu.be/H8ypOztW3qA[/video]
Final Impact DIY Switchback DRL Circuit