#1632

Episode 1632 chip of the day
50MHz monolithic amplifier
Be a Patron: / imsaiguy

[@DAVIDGREGORYKERR]

That chip can be used as a balanced mixer if you inject into the AGC pin.

[@youtubeaccount931]

oooh really? I'm going to look that up, I could use a mixer and i have one of these chips.

[@RonDogInTheHouse]

Thanks for the chip of the day. Even though some of the items featured at times may be old stock, and sometimes hard to get, I really learn a lot from these videos. Just wanted to say thanks.

[@Dennis-uc2gm]

I remember the MC1350, it was used in a lot of stuff back in the day. Heath Kit seemed to like it, remember it in a number of things I built from them.

[@lmoline63601]

I used a MC1350 as a RF amp in a TV decoder running on channel 3. I am also using it as a IF amplifier in a couple receivers.

[@W1RMD]

Thanks for sharing!

[@frankowalker4662]

Neat little chip.

[@d614gakadoug9]

In my opinion redrawing the output transformer obscured matters. No phasing dots were shown on the two-winding transformer, which I think gives the impression that the phasing in both is the same (e.g. "dotted" ends of both go to V+). The original schematic clearly shows a centre-tapped transformer. The latter is critical to correct operation which in effect applies AC to the primary. If there were two windings with the same phasing this would not be the case.

[@herbertsusmann986]

This is one of my favorite parts for homebrew HF receivers. Too bad they have not been made in a long time. NOS parts are still around though but prices have gone up.

[@MidlifeRenaissanceMan]

They are made by another company under the chip number ML1350. Apparently a drop in replacement

[@youtubeaccount931]

I have one of these chips I got off a circuit board i scrounged on an oven that was being thrown away. I'll need to test it first before I consider it good to use.

[@davebleamwa2bxy799]

I have a tube of about 35 of them in mu stash box. I have a signal generator circuit that can AM modulate by putting sine wave into the AGC port.

[@davidjh7]

Isn't the front end a Gilbert multiplier configuration?

[@M0UAW_IO83]

Getting rare these days, useful little chip though, used in a lot of homebrew ham projects

[@CannonballCircuit]

Thanks for a great video! Would you be opposed to the idea of doing a deep dive video (or series) into the transistor circuits shown in the circuit schematic for the MC1350?

[@IMSAIGuy]

you can start with this if you haven't see the series: kzbin.info/www/bejne/kGmtdaasm7-dgposi=YFuY153zBEy924nL

[@KeritechElectronics]

The output stage is a nice counterpart of a push-pull tube amp, haha! None of that DC saturation or common mode interference rubbish.

[@jimflux9895]

Please do a video explaining return loss. If you do it i will understand it

[@IMSAIGuy]

kzbin.info/www/bejne/ZnjVfnx9dt55i6csi=TuRVc0MIM3d0a7vA

[@oldornot]

So many guys..

[@hobbyrob313]

very nice! Can you also do something with higher frequencies? say 100 to... 150MHz? Healthy and Friendly Greetings from the Netherlands! Rob

[@klafong1]

The data sheet for the similar MC1490 shows a detailed RF characterization of the device. At 100 MHz, the maximum voltage gain directly driving a 50 Ohm load is on the order of 7.5X. The gain takes a nose-dive at higher frequencies. It may be possible to improve on this by impedance-matching the input and output.

[@technishn]

I think the AGC range at 9/10.7 is about 85 dB compared to the spec at 45 MHz. The MC1349 is similar to the Mc1350.

[@magnuswootton6181]

when i look at those ic schematics i just see a waste of transistors.

[@JaenEngineering]

What should they use instead of transistors then?

[@andymouse]

Why a waste ?

[@magnuswootton6181]

@@andymouseI bet I could do this with 2 transistors. its just an amplify, u dont really need opamps if you can wire a transistor into a differential type thing anyway.

[@JaenEngineering]

​@@magnuswootton6181I look forward to you posting a link to your video showing that how to do it with two transistors.

[@andymouse]

2 transistors as a 'long tailed pair' or 'diff amp' yeah, but you aint finished at all your just starting. Keep on learning.@@magnuswootton6181

[@erikburman530]

Interesting but all your hand waving and finger pointing was a bit difficult to follow. Maybe one day I'll understand.