6V to 12V dc-dc boost converter using 555 timer IC
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1 6V to 12V dc-dc boost converter using 555 timer IC dc-dc converter schematic This 6V to 12V dc-dc boost converter can drive a load in 12V about 1.5A current.the 555 timer IC is operated in astable mode, generates about 545Hz frequency of about 58% duty cycle. Part List: R1-2 kilo ohms 1/4W R2-5 kilo ohms 1/4W R3-2.7 kilo ohms 1/4W R4-22 ohms 1/4W C1-220nF C2-100nF C3-1000uF ( higher the better) electrolytic capacitor rated 16V L1-40 to 60 turns #20AWG in ferrite antenna bar D1-4A rated diode or higher DZ - 1N5242B or 12V zener diode (1W) Q1 - TIP41C or two parallel 2N2222, or NPN transistor (min 3W power) Q2-2N3055 or similar NPN power transistor Q3 - TIP41C or 2N timer IC Part list Diagrams: click figures to enlarge 555 IC pins TIP41C pinout
2 2N2222 pinout 2N3055 pinout windings in antenna ferrite rod Enjoy building this converter and feel free to replace any parts. You can add also series resistor and LED across the output of the circuit for indicator. Read more at
3 Do-it-yourself ECG Patient Simulator A low-cost solution created by Frank Weithöner One of the most important test equipment in the biomedical workshop is the ECG Tester or Patient Simulator. The Patient Simulator is connected to the ECG monitor and delivers the typical ECG signal. Only with such a tester an ECG monitor can be repaired, the functions and alarm settings checked and loose connections of the patient cables be located. A Patient Simulators usually costs several hundred dollars and is unaffordable for small hospital workshop specially in developing countries. But the realization of an electronic circuit which creates an ECG signal must not be too difficult and expensive. Here I want to introduce you my solution. Only a handful cheap electronic devices are used. No special or exotic IC is needed. All parts should be available in the nearest electronic shop or can be found on old electronic boards from your workshop store. This circuit consist of a handful electronic devices which delivers a quartz crystal stable ECG signal for 60 and 120 heart beats. Only common electronic parts are needed and the building costs are below 20 $. Function: The above shown ECG signal is complex and will be created by different single signals. The P,Q,R,S,T signals are formed in different steps and then are put together in the right sequence. A
4 shift register does the sequence job, RC combinations the frequency and amplitude of the single waves. IC1 contains an oscillator and a shift register. At the output of pin10 a signal with 16 Hz triggers IC2. IC2 is a counter with 10 outputs. When output 0 of IC2 is active (pin3) the R-C combination R8, C5 creates the P-wave. When the counter jumps to output 3 (pin7) the R-wave is created by R4, C4. The negative part is reduced by the two diodes and simulate the following S-wave. When output 5 is active (pin1) the T-wave is created by R7 and C5. The outputs which are not connected create the needed pauses between the signals. All signals are put together through R3 and R6 which level the respective amplitudes. When one sequence is finished the shift register stops. Output 9 (pin11) is connected with ENinput (pin13). Only when a reset pulse reaches the counter (pin15) the counter starts again. This reset is also created by IC1. Because in addition to the 16 Hz trigger signal the IC also provides a 1 Hz and a 0.5 Hz signal at pin14 and pin13 which correlate a heart beat rate of 60 and 120 (switch 2). Therefore the square signal has to be transformed in a positive needle pulse. This is the duty of the combination C6, R11, D4, R10. Because this pulse comes earlier or later (0.5 Hz or 1 Hz) only the lengths of the U period is shorter or longer. The PQRST wave form is not effected. A small LED D3 with resistor R5 connected to output 3 (pin7, IC2), flashes during the R- period. The final resistor combination R12-R15 converts the bipolar signal from the electronic board into the needed three pole output signal. Note: The circuit is designed for common electronic devices. All parts can be found on old electronic boards or at the nearest electronic shop. But if you have problems to find the clockcrystal of MHz you can take a 4.43 MHz PAL-crystal from a TV. Your output signal is as good as with the clock-crystal but the heart rate will change to 63 and 127 beats per minute.
5 (large image) Part list: R1 = 4K7 R2, R8 = 1M R3, R4, R9, R10, R11, R12, R13 = 100K R5 = 1K R6, R7 = 470K R14, R15 = 220 C1 = 22 p C2 = 82 p C3, C4, C5, C6 = 220n IC1 = 4521 IC2 = 4017 D1, D2, D4 = 1N4148 cristal = Mhz D3 = LED 3 mm 2 x IC sockets 16 pin Here the first design: (large image)
6 Here the second version: (large image) (large image) (large image)
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