A Simple Low Cost Battery Operated Function Generator Circuit 1Hz to 1MHz

To design a simple function generator circuit capable of generating sine, square and triangle output waveforms in the range of approximately 1Hz to 1MHz with a peak to peak voltage of 15 volts.

The nature of the design is flexible and may make use of analogue or DDS technology. Where a microcontroller is used, it must be programmable from a blank device and the code must not use 3rd party licensed code. The firmware should be simple, lightweight and fully commented.

Specialised, rare, obsolete and hard to obtain components such as ICL8038, MAX038, XR2206 or NTE864 must not be used. Particular attention should be paid to component costs. Parts should be readily available from Rapid Electronics, Farnell Electronic or RS Components.

The function generator must be operated by basic controls. Menu systems using digital rotary encoders/push switches must not be used

Variable frequency control: 10 turn rotary potentiometer or encoder. (seen note below)

Frequency Range Select: This must be a rotary switch type selector. Selectable ranges of 10Hz, 100Hz, 1KHz, 10KHz, 100KHz, 1MHz

Output voltage Control: This must be a rotary potentiometer.

Waveform Seletor: This must be a rotary switch type selector.

Power Switch: This must be a simple on/off switch. The switch must fully isolate power from the circuit (though the battery charging section will still operate).

The function generator requires the following displays:

Output frequency display: This must use 7 Segment LED displays. 7 Digits.

Output voltage display: This must use 7 Segment LED displays. 3 Digits 1 Decimal Place

Power indicator: When powered on the circuit must have a bi coloured LED which is illuminated green when the battery is charged, and illuminates red when the power is too low for reliable operation. This LED must also serve as a charge indicator when the circuit is turned off but charging the batteries. In this case it will show red when the battery is charging, and green when the battery is fully charged.

Power supply:

The circuit must be capable of operating from a battery for a period of at least 4 Hours.

The circuit must be able to operate and charge from a 'Plug-top' (Wallwart) type power supply.

The circuit must be capable of charging the batteries whilst in operation.

The batteries must be of the Nickle Metal Hydride type.



- Voltage: 0.6V to 15V peak-to-peak (0.3V to 10V into 50 Ohm)

- Triangle Wave Linearity: Better than 99%

- Square Wave Rise & Fall times: < 100nS

- Sine Wave distortion: < 1%

- Amplitude Flatness: +/- 1dB

- Display Accuracy - Frequency: +/- 1%, Voltage: 5%

- Display refresh rate: > 3Hz


A schematic diagram for the complete system.

A complete parts list with manufacturer and supplier order codes.

Full and complete source code listing including hex files for the microcontroller if applicable.

You are not required to produce a deliverable prototype, however your design must be fully verified before the assignment can be considered complete.

A PCB design is NOT required but may be offered as an extension to the project.

Frequency Control.

The main objection to using a rotary encoder was that it can take many turns to achieve the required setting, particularly as there is a limited speed at which an encoder can be rotated before it misses pulses. This tends to make them slow and frustrating to use. A method of detecting the rate at which the encoder is being turned, which would then affect the rate of change of the frequency setting would be a way to solve this limitation. The increments could be set to suit each of the six frequency range settings. This offers the user precision control whilst allowing them to also make rapid adjustments.

Note: Your bid is is for completion of the work as described above - not a starting point from which to negotiate a realistic price! Please include the word SigGen in your proposal so I can see you have actually read these project requirements.

Taidot: Arduino, sähkötekniikka, elektroniikka, Mikrocontroller, Piirilevyn asettelu

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Tietoa työnantajasta:
( 2 arvostelua ) DERBY, United Kingdom

Projektin tunnus: #16211548

Myönnetty käyttäjälle:



£300 GBP 15 päivässä
(4 Arvostelua)

19 freelanceria on tarjonnut keskimäärin %project_bid_stats_avg_sub_26% %project_currencyDetails_sign_sub_27% tähän työhön


SigGen Hello, Have a great day. We will deliver a working design of the hardware and to make sure it works without any flaw, we will prototype it. Please feel free to contact us. Best Regards, Shahbaz.

£1500 GBP 30 päivässä
(56 arvostelua)

hello,Client I have 13+ years experience in circuit, PCB design, manufacture and assemble. also I can code the firmware. thanks

£1000 GBP 20 päivässä
(44 arvostelua)

Dear Sir! I'm very interesting in your job. Actually, before i already many worked on electronic device development and i have a large experience in this area. Please feel free to check my portfolio. Especially, i Lisää

£666 GBP 10 päivässä
(30 arvostelua)

Hi i can help you see portfolio for samples of works. Senior ENGINEER has more of 40 years’ experience in this profession, developing Hardware and Software Expertise in video processing and associated simulation and e Lisää

£1111 GBP 30 päivässä
(52 arvostelua)

i am a embedded hardware and software expert and have rich experience with hardware design and firmware development. i designed pcbs and developed firmware for it , manufactured prototype directly. you can check my Lisää

£500 GBP 10 päivässä
(21 arvostelua)

Hello Dear, I am an expert with more than 15 years of experience in the field of embedded systems, electronics, prototyping and PCB Layouts. I am expert in analog design also. Please contact me for the best quality Lisää

£400 GBP 10 päivässä
(40 arvostelua)

Hi there , I am Electrical + Software engineer with 18 years experience . I am interested in your project A Simple Low Cost Battery Operated Function Generator Circuit 1Hz to 1MHz , Kindly send me a cha Lisää

£555 GBP 10 päivässä
(15 arvostelua)
£1000 GBP 28 päivässä
(45 arvostelua)

Hi There I have checked your project description and understand everything. I am very confident that i can do this project perfectly. Thanks

£250 GBP 10 päivässä
(37 arvostelua)

Hello, I believe I could answer the product development needs of your project in terms of both design and hardware development. My previous project includes the SigGen circuitry so, I'm familiar with the core component Lisää

£830 GBP 30 päivässä
(3 arvostelua)

I can produce a SigGen supported by a Proteus simulation for you in 10 days.

£555 GBP 10 päivässä
(13 arvostelua)

Hello. I have experience in prototyping custom electronics devices hardware(schematic, PCB, components)/firmware(microcontrollers)/assembling(casing, 3D printing) and connected software. Lets talk details over chat. Lisää

£750 GBP 10 päivässä
(14 arvostelua)

I am electrical engineering .I have lot of experience working with various employers globally. Can I do Circuit Analysis and design, Power System Analysis,DC/AC machines Electrical Distribution , translation and te Lisää

£250 GBP 4 päivässä
(16 arvostelua)

I have some questions: 1. "plug-top" Power Supply's in/out param(include voltage/freq/current )? Can I select a other one? [login to view URL] there a size limit to case? [login to view URL] of case ? I live in china,I can find cheaper Lisää

£1000 GBP 30 päivässä
(8 arvostelua)

Hello my name is Maria I am an electronic engineer, I would love to design this circuit for you, I have plenty of experience working with electronic and electric designs (squematic and PCB layouts), programming microco Lisää

£400 GBP 10 päivässä
(1 arvostelu)


£777 GBP 30 päivässä
(0 arvostelua)

A proposal has not yet been provided

£660 GBP 60 päivässä
(0 arvostelua)

A proposal has not yet been provided

£250 GBP 20 päivässä
(0 arvostelua)