You need two resistors one is in series with the led (across the charging resistor) to indicate its working...! S -----Original Message----- From: piclist-bounces@mit.edu On Behalf Of David = C Brown Sent: 30 October 2018 14:49 To: Microcontroller discussion list - Public. Subject: [EE} Am I carrying KISS too far? Power supply for a circuit with a handful of CD400 chips. 12vdc from wall-wort charges a 9volt NiMH through a series resistor. CMOS runs of battery. Just the two components. What have I overlooked? __________________________________________ David C Brown 43 Bings Road Whaley Bridge High Peak Phone: 01663 733236 Derbyshire eMail: dcb.home@gmail.com SK23 7ND web: www.bings-knowle.co.uk/dcb *Sent from my etch-a-sketch* -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .