No problem. I think the correct term is "local negative feedback" and its the basic principle used in tube amp stages to to control gain and help linearise the circuit
Yeah thats the same for ,e, I never really made the connection for a long time either. It works better with FET's but BJT's in class A mode for a limited range it works well too and thats basically whats going on in the MMIC device. Gerry
Nice board. I wonder if it would work in my much older 5334B which had a 1.3GHz C channel option, which is a /64 prescaler. Seems like it would, if Andy is thinking of selling boards or offering his design files online I'd certainly consider building/buying one.
@zaraak323i, if you look at the internal schematic of the MMIC you will see that the output device has a resistor in its emitter path to the GND pin, that is where the negative feedback is created. The voltage dropped across this resistor will increase as more current flows. Have a look at any simple tube amp stage and you will see that local negative feedback is introduced by inserting a cathode resistor. The higher the value of this resistor the lower the gain of the stage.
@keenantims, I did ask him that at the time, I don't believe he has any plan to make and/or sell these, I think he built a small handful for how own counters. Gerry
Thanks for the video. Did your instrument just allow you to jump to Channel 3 after the upgrade module was installed? Because without the module, the instrument only switches between Channel 1 and Channel 2.
Yes the instrument would switch to channel three after the board is installed, it detects the presence when one of the pins on the connector is grounded.
Hello friend I have a frequency of these 53181A and I'm starting to familiarize myself with it and would like to know how I do to be able to have a notion of channel 2 and because when I put that output of 10mhz that has in it and inject in channel 2 a Frequency is varying this and normal or can this be with problems it has a 010 timebase option could you help me to clarify this doubt
No problem. I think the correct term is "local negative feedback" and its the basic principle used in tube amp stages to to control gain and help linearise the circuit
Yeah thats the same for ,e, I never really made the connection for a long time either. It works better with FET's but BJT's in class A mode for a limited range it works well too and thats basically whats going on in the MMIC device. Gerry
Nice board. I wonder if it would work in my much older 5334B which had a 1.3GHz C channel option, which is a /64 prescaler. Seems like it would, if Andy is thinking of selling boards or offering his design files online I'd certainly consider building/buying one.
@zaraak323i, if you look at the internal schematic of the MMIC you will see that the output device has a resistor in its emitter path to the GND pin, that is where the negative feedback is created. The voltage dropped across this resistor will increase as more current flows. Have a look at any simple tube amp stage and you will see that local negative feedback is introduced by inserting a cathode resistor. The higher the value of this resistor the lower the gain of the stage.
I have an idea to make a custom OCXO board with MCU + temp sensor + PWM controller of fan speed to reduce noise of switched off instrument.
@keenantims, I did ask him that at the time, I don't believe he has any plan to make and/or sell these, I think he built a small handful for how own counters. Gerry
Thanks for the video. Did your instrument just allow you to jump to Channel 3 after the upgrade module was installed? Because without the module, the instrument only switches between Channel 1 and Channel 2.
Yes the instrument would switch to channel three after the board is installed, it detects the presence when one of the pins on the connector is grounded.
Thank you for the comments
Hello friend I
have a frequency of these 53181A and I'm starting to familiarize myself
with it and would like to know how I do to be able to have a notion of
channel 2 and because when I put that output of 10mhz that has in it and
inject in channel 2 a Frequency is varying this
and normal or can this be with problems it has a 010 timebase option
could you help me to clarify this doubt
thats a good job garry Nice to have one for my old racal 1998
good video top marks from me
Very nice Gerry
Thank you Dennis
Nice video.
Nice job !
Thank you visas...
Thank you @orbiter8
I wanted a 53131A but they are $700+ on eBay.
Hi, yes they are not cheap but they are very good counters. Gerry
Mine is a old HP 5335 that I made from three that were in various condition.