MAX038 Generator Issue: MAX442 Replacement or Alternative for 1Hz-30MHz Circuit

Question

Hello

I have a problem with MAX038 - I wanted to put together a generator 1Hz-30 M Hz but I do not know what to do with this MAX442. Can I not give it there or replace it with something else and it is there? What do you think about this ?

MAX038 Generator Issue: MAX442 Replacement or Alternative for 1Hz-30MHz Circuit

MAX038 Generator Issue: MAX442 Replacement or Alternative for 1Hz-30MHz Circuit

c2h5oh · Answer

Hey ! MAX442 is a two-channel amplifier operating up to 140 MHz. Used in VID MUX / AMP applications. Thus, it serves to amplify the signal and adjust the voltage levels. In addition, it is a pity to waste the MAX038 capabilities to build a generator working in such a narrow frequency range (1Hz-30Hz). You could do a multivibrator on several transistors.

milik · Answer

But the stain I wrote Hz instead of MHz was supposed to be 1Hz – 30MHz – I'm sorry . From what I found, MAX443 costs 100PLN so it's completely out. As for the possibilities, at the beginning I wanted to make a generator that would be able to work as a wobbler, but nowhere did I find such a scheme so I stayed at the generator itself.

c2h5oh · Answer

Hey !

Can you use transistors? (broadband amplifier) In total, you only need to amplify the signal from the circuit and create a buffer.
Without the buffer at the output, the MAX behaves quite strangely. The cables for the range switch are very important. They can not be too long. Ideally, the switch is soldered directly on the generator board and has short paths.

qantas · Answer

I used mA733 in this circuit  to the frequency meter I connect only by resistance 47om. powodenia.

PJS · Answer

I used MAX4381 - but you have to convert the PCB and the R12 resistor to 10k, because (at least I was getting an amplifier). Maxim sends a free sample of this system (but in the smd version). Oh, I did not make the generator up to 30MHz, because I do not need that much, but max4381 has a band of 210MHz, so it should work.

milik · Answer

Qantas could you tell me how you did it with including A733? Because it is a bit different from the usual operational increase and I'm afraid that I will do something wrong.

qantas · Answer

ok but tomorrow because only tomorrow I go to work and there are diagrams. I do not have a scanner but I'll sort it out somehow. so far.

qantas · Answer

Hello and sorry for the lapse.
below I put a circuit diagram which I have used in my generator. I adapted this system from the pulse formation system of some frequency meter, but unfortunately I do not remember the publication.
As a transistor in my system there is BFY90, but I suspect that I will go with everyone else.

Best wishes and good luck.

MAX038 Generator Issue: MAX442 Replacement or Alternative for 1Hz-30MHz Circuit

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