DIY Function (Signal) Generator




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Joseph Johnson: Do you still have the schematic for this? It is no longer available from Circuit Specialists. 

Ramses Faradis: Gran circuito.

furulevi: this goes to 7000 Hz only?

smokescreen36: could anyone help guide too a mini audio spot light 

Riskteven: I want to feed through a transformer to output an effective value of 230 Volts AC but with a variable frequency. I plan to upload something very fun on Youtube but of course a sine generator is still what I need. How to do?

electronhacks: Coax would be better but a regular wire would work.

ElektroHut: have you tried any other op-amps. Maybe one with better slew rates, etc? Just wondering.

gypaete09: Don't know what the four diodes do? They act like a pos/neg voltage limiter (2x0.6V), which due to the diode forward current characteristics transform the incoming triangle wave to a "almost-sinwave".

Richard Wolfe: Simply cool.

Helge Sverre Hessevik Liseth: If you connect that to a speaker.... would it make sounds?

leviterande: maximum frequency??

electronhacks: @ElektroHut Nope I have not tried any others, to many other projects to do!

The1970sInfatuate: Man, that is frickin' awesome!

jeetendrag10acc2: could we buy then pre-assembled? i am not too good at assembly and soldering,and i need a lower range signal generator.(not too expensive)

t4peworm: Hey where in the schematic did you add a light for power?

Kris Lonewolf: Can i use LM324 N Instead LM348 IC

humxa24: look up for a pinout diagram for both on google

Slovenija12345: its something wrong if i use polyester capacitors??

Shadi Soundation: Great !!!

MostElectronics: nice job!

Jeri Ellsworth: Good job.

garrett Baldwin: set your trigger

Kris Lonewolf: Thank you man!

Sophie333C: Hi, built this function generator on breadboard, I managed to get 7.6kHz output. The waveforms are ok at low frequencies, but not too good as you go up the frequency range!

Rui Santos: For the output waves did you use which type of wires? Coaxial wires? or just normal wires? thanks... if you want your led blinking you can add to the circuit a 555 IC and it will easily blink the led... i hope it helps you

Christopher Chang: This is great work! I'm actually working to try to build a 7400 based function generator but there's a lot of issues I'm running into with the sine wave atleast. I may have to abandon it because your design looks much nicer than mine :)

electronhacks: It is easy for you to do this type of research, do a search for the IC's name and "Datasheet" (You will need this if you plan to use the IC anyway). It looks like the pin-out is the same, the IC's are similar so since we are making a fairly crude device chances are you can safely substitute the IC's. That however does not mean you will not need to do some experimentation and possibly modify the circuit.

Kris Lonewolf: It's Working i just assemble this device and it works fine. But i have one problem i want to put one led diode to blink on output signal. i put single led diode with 220 ohm resistor on output and led blinks slow and fast depends of potenciometer bat when i put some load on output led stop to blink. i dont want connect led just on power supply i wanna led to blink. can you tell me how to resolve this. Thank you

Kris Lonewolf: I have same question i found only LM324N can somebody know is this same type of Chip

Rui Santos: thanks i will try this circuit soon, thanks for the reply! Good luck with your projects

Zach Sylvester: battery almost expired

Suli Tavi: Could you use a different op amp to have a bigger frequency? Could you tell me if this is posible? to have a frequency range greater than 7000Hz (e.x could it be modified to reach 20MHz) with an quad op-amp ic?

sunnypiyush: Would the connections remain the same if i use LM324N instead of LM348?
Rating:
DIY Function (Signal) Generator 4.9 out of 5

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DIY Function (Signal) Generator