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| converter schematic |
This buck converter is driven by 555 timer IC and converts 12V dc from a battery to 9V dc. The 555 IC (operated in astable mode ) generates pulses of voltages of 75% duty cycle. This pulses turns the transistor on and off and drives the inductor L (buck converter circuit), and as a result generates 9V dc output. For this configuration,
Ra =27K
Rb =10K
C =10nF
L = 20 turns of #22AWG in antenna bar
Q = TIP41C or any of the same specs
Cout = 2200uF (higher the better)
You can add 1N4739A zener diode at the output side for better regulation.
sir for L what type of choke core can be preferred instead of antenna bar?
ReplyDeleteand what diode is placed at D ?