6: Components layout for the signal generator PCB Download PCB and component layout PDFs: click here 5: Actual-size PCB layout of the signal generator Fig. Connect LED3, switches S1 through S5 and potmeters VR2 through VR4 on the front panel for power-status indication, frequency selection and signal amplitude control, respectively. After assembling the circuit on the PCB, connect variable power supply using a two-wire cable from CON2 to CON3. 4: Components layout for the power supply PCBĪn actual-size PCB layout of the signal generator circuit (Fig. 3: PCB layout of adjustable power supply Fig. The circuit can be powered by either 230V AC, 50Hz mains power supply with transformer X1 or 15V DC power supply connected to CON1. Connect LED1 and LED2 on the front panel for power-status indications. Variable power supply for the signal generator section is available at CON2. After assembling the circuit on the PCB, connect the line (L) and neutral (N) to 230V AC mains supply. Diodes D6 through D9 protect timer outputs from over-voltage and under-voltage.Īn actual-size PCB layout for the power supply is shown in Fig. These inverted outputs are available across CON5. Resistive dividers comprising R17 through R20 provide three more amplitudes by dividing the inverted output by 10, 1. The amplitude of IC3’s inverted output available at CON5 can be adjusted using potmeter VR4. These frequencies are also available across CON4 at pins 3, 4 and 5, respectively. That is, the output frequency of IC2 is divided by 10, 1. Resistive dividers comprising R11 through R14 provide three more amplitudes. The amplitude of signals can be adjusted using potmeter VR3. The frequency signal output produced by IC2 is available at connector CON4. Here, forward resistances and voltage drops of diodes D3 and D4 are neglected and inverse resistances of diodes assumed to be infinity. When Cx=1nF and VR2=0-ohm, the maximal frequency (Fmax) is: Where Cx may be 1nF, 10nF, 100nF, 1♟ or 10♟.Īssuming switch S1 is closed and Cx=1nF and VR2=22-kilo-ohm, the minimal frequency (Fmin) is given as below: The frequency (F) is determined by components connected to pins 2, 6 and 7 of IC2 as follows: Table below shows calculated frequency ranges of squarewave signals. The signal generator produces forward and inverted signals through IC2 and IC3, respectively. It is built around two NE555 timers (IC2 and IC3), an LED (LED3), seven BAT42 Schottky diodes (D3 through D9) and a few other components.įig. The circuit diagram of the signal generator is shown in Fig. The variable power supply can be used for additional adjustment of the timers’ amplitude. You can vary the output from 1.25V to 15V using potmeter VR1. If you would like more information regarding placing international orders, please view the faq page under the “Do you accept international orders?” section.The power supply output available at connector CON2 is variable. If you have any questions, please have a look at the customer service portal where you will find answers to many common questions, or you can reach out to us through the contact us page. If the order is urgent, please contact us to see what can be arranged. In-person pickup is currently not available. International orders are shipped through Australia Post and Sendle courier service depending on the most economical at the time. Shipping costs for international orders vary depending on location and package size, where possible we have kept this to flat rate charges to reduce confusion. Orders outside of metro orders can take 2+ days longer than the estimates stated above. #Generator piloobraznogo napryazheniya ne555 fullExpress Post – $12.00 (Cost may be higher depending on product size) – Sent via Australia Post Express Service, 1 – 2 business days for metro orders, potentially longer for orders outside of metro zones, with full tracking. #Generator piloobraznogo napryazheniya ne555 free
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