The circuit has 5 lines (+12 / -12 / +5 / -5 and 0V) that needs to be controlled from a single SPST switch. I already have a power supply that has such outputs, therefore i will not make another one for this. To control the power lines, i used 2 relays. The first had 3 NO connectors and the other one had 2 NO outputs. This is the schematic diagram of the connection:
The wires are directly soldered on the pins of the relays
I had the relays hacked from a central heating controller. I soldered the wires directly on the contacts of the two relays. The diode is also directly connected on the two relays. The whole project will be fixed on the bench-wood. It will be covered only with a formed acrylic-glass. I want to be able to remove the bench-wood without having to remove this project. After all, the bench-wood will host more projects. It would be completely wrong to dismount every project from the bench wood, every time that i want to remove it.
I please need you to design a circuit base on this Multi-Function Chip which can be used to Switch Electromagnet at Adjustable Frequency from 1hz and above.
Please make the circuit simple as I am not trained in Electronics but I can make things out of simplified circuit diagrams.
This is my frst time here so please bear with me.
Is there a way to adapt this circuit device to function as a part of a tig welder? I had electronics in high school the late 70's and am terribly rusty. I am now more of a gear head and would like to combine the best of two worlds.
@Marc Bonnier i discourage you to use this PCB because it causes a lot of interferences above some MHz. I am not sure if i have any of these PCB files any more (i had a fatal crash some time ago and lost almost all my older project files)
I have a MAX038 chip and I'm planning to make the function generator detailed here. However, I'm having trouble locating the OP37Z op-amp. Do you know where I may be able to find one or can you recommend a replacement?
Hello Jogie. The chip is not produced any more, and is very expensive. I discourage you to copy this circuit. I did this because i had this in stock a lot time ago. If you find it somewhere in stock, it will cost a lot of money. I do not know a replacement part, and i do not think that exists one. But i do know that there are other chips with the same functionality.
Thanks for this site. I now found a fully working function generator, but sir, the chip which u use there is not available in Philippines. Can u recommend another IC to be used that is compatible with your circuit diagram. A replacement for the expensive IC sir coz i cant afford it, our school requires us to make function generator..
Can u send me sir the schematic diagram with their respective components???
The only problem with this project is the chip availability and price. The MAX038 was discontinued by Maxim years ago and one can find it only overpriced on Ebay. Unfortunately there are no direct substitutes and no other chips that go up to 20 MHz as the MAX038 did. The only similar chips around are the XR2206 and the ICL8038 (which has absolutely nothing in common with the MAX038 despite the somewhat similar numeration), both are 20+ years old and both won't go much further one or two MHz.
Nowadays if you want to build a modern signal generator DDS is the solution. Unfortunately it requires an additional MCU, more components and writing code.
I am Anthony Merenda radioamatore with it initials I8CQ, and I am enrolled to grix site Italian web, of electronic amatoriale. And having an integrated maxim 038, I have looked for on the web to find a project and the motor of search google you/he/she has brought me on his/her sito.Visto the project and his/her validity, I ask her if it authorizes me to pubbbicarlo on site web of grix.it. naturally you/he/she will be quoted both his/her site and the planner. aspect his/her news thanks.
antonio snack I8CQ.
P.S. I want to complimenti