What is the point of reviewing a cheap timer module, especially if it is based on the ubiquitous 555 timer chip? Recently I got an ‘updated’ version of the common 555 timer relay module. This time it ...
Figure 1 This classic 555-based timer is valid only for duty cycles greater than 50%. Figure 2 The simple addition of a bypass diode makes this timer circuit valid for low duty cycles. Diode forward ...
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