Right so I've started on a little project to improve the flashing LEDs in use on my old VW Beetle.... It operates on 6v DC... The PCB can be a maximum of 25mm long and 16mm wide to allow for clearance within the semaphore arm... Heat to be kept to a minimum - I don't want anything melting! It would be a bonus if it would work on both 6v and 12v - one less thing to worry about if I convert my car over to 12v! So lets begin with what is in place at the moment https://imgur.com/ufQwv4Z https://imgur.com/EcFKhb6 I stripped the components off the board to reveal https://imgur.com/dbOzYNS https://imgur.com/DlqWml9 This is getting somewhere near the design of the board.... These are the components from both sides of the board... https://imgur.com/O6S8RTw So we have - 4x LEDs (I'd like to identify what type they are...) D882 - NPN Transistor 8 Pin IC - I would assume this to be a 555 timer - as the LEDs flash... 2x KL4 - transistors Diode 2x capacitors of unknown value 4x resistors (102, 103, 2x 120) I then lightly sanded the board to remove the solder mask and reveal... https://imgur.com/af4tmkI https://imgur.com/d02FFrr I then got to work in my favourite image editing program - and traced the board and vias out to this.... https://imgur.com/PoRjQ6O https://imgur.com/clD7ohK The board is the same way around in each picture for ease of recognising where everything goes.... Ideally I want to drive an additional 4 LEDs from this arrangement - giving a total of 4 per side... Given the space requirements is this feesable? If not how else can this be improved? Im all ears while I get the design into a program so I can get some prototype boards produced!