simple wiper delay

old hat? elektor april 1980 — 4-43 old hat ? Obviously, this is not the first time we have published circuits for use in cars. While browsing through some earlier issues, we found several interesting little circuits. A few of these are repeated here, for the benefit of new readers. In general, limited stocks of the printed circuit boards are still available. simple wiper delay 7For those readers who require a very small and simple wiper delay control, the circuit described here is ideal. This circuit was in fact first published in Elektor E17 but has been so successful that its inclusion here is not out of place. The circuit is based on the well known 555 timer and can be seen in figure 1. The maximum output current of this IC is 200 mA, so it can drive a relay direct. This circuit will operate on 6 or 12 volt cars. The only circuit change is the relay (12 V relay for a 12 V car, 6 V car 6 V relay). Most circuits using the 555 don"t give a wipe immediately after being switched o...