12V To 24V DC to DC Converter
12V To 24V DC to DC Converter
A simple step up DC to DC converter with a maximum draw of about 800mA. Applying a op-amp as a square wave oscillator to trig an inductor and another op-amp in a feedback loop, provides a 24V power source for many uses.
R1,R2,R3,R4,R8,R7______100K 1/4W Resistor
R5_____________________470 Ohm 1/2W Resistor
R6_____________________10K Linear Pot
C1_____________________0.01uF Mylar Capacitor
C2_____________________0.1uF Ceramic Disc Capacitor
C3_____________________470uF 63V Electrolytic Capacitor
D1_____________________1N4004 Rectifier Diode
D2_____________________BY229-400 Fast Recovery Diode
Q1_____________________BC337 NPN Power Transistor (heatsink needed)
U1_____________________LM358 Dual Op Amp IC
L1_____________________60 turns of 0.63MM magnet wire on a toroidial core measuring 15MM (OD) by 8MM (ID) by 6MM (H.
R6 sets the output voltage. This can be varied with calculated by Vout = 12 x (R8/(R8+R7)) x (R6B/R6A).
[source:Aaroncake]