Guides, charts, diagrams, etc. I have built it on a breadboard and it appears to be working, the audio coming out is high quality going straight into my hifi amp. The only thing I can't work out is what the 47k variable resistor is for? Mine doesn't appear to do anything whatever way you tune it. I have checked the components to make sure everything is in place and is of the correct value.
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Guides, charts, diagrams, etc. I have built it on a breadboard and it appears to be working, the audio coming out is high quality going straight into my hifi amp. The only thing I can't work out is what the 47k variable resistor is for? Mine doesn't appear to do anything whatever way you tune it. I have checked the components to make sure everything is in place and is of the correct value. If I pull the VR out of the breadboard it carries on without it lol I would of thought it was to control the level of either the input or output?
Problem is the BAn datasheet is all in Chinese so not very helpful. Seems that pin 2 and 9 associated with the VR are going to the inverting input of the built in op amps inside the BAn. I have got the input connected straight to my cd player via a potentiometer so I can control the audio level going in.
If I set the audio level in to 1v peak to peak the output appears to be 2v peak to peak. If I turn the pot right up so the input is getting the full level of the cd player sometimes 6v peak to peak on the oscillocope! The only thing I have noticed is occasionally I am seeing audio peaks outside of this 2v span for a split second.
Is that normal with a limiter or will that overmodulate a carrier more than 75khz if connected to a transmitter? You do not have the required permissions to view the files attached to this post. Last edited by s on Tue May 10, pm, edited 2 times in total.
The original idea of the input pot was to provide a crude input sensitivity control - these days I'd just put a fixed 10k resistor in place of the pot and the 4k7. I remember getting the for the first time, and lashing up the limiter you see here.
I was very pleasantly surprised by the quality. Smaller values give faster response, but if you go too small, you get really gross bass distortion. Bear in mind that this is a very basic device - it's capable of pretty good results, but you'll have to construct something much more complex to get the limiting you hear on commercial stations.
This also had a clipper - and clip indicators - and gave a very good account of itself. One of the Yank TX companies copied the circuit mostly and offered a kit for it back in the 80s. I'll have to look through a couple of old hard drives.
Will definitely have an experiment with the values. Ideally just want something to stop me overmodulating the carrier. Ive just got myself a modulation meter so will be experimenting with this and a small transmitter
Odpowiedniki elementów półprzewodnikowych V-03-2019
The preamplifiers are directly coupled to the head and do not require coupling capacitors. This prevents tape head magnetization and pop noisegeneration. An ALC circuit with large dynamic range can be constructed with addition of just an external detector and time constantcircuit. Applications of the BAN include Stereo radio cassette players. BAN features: 1 The input block uses a bias circuit that does not re-quire coupling capacitors; 2 ALC circuit requires addition of just an external detector and time constant circuit; 3 Wide operating power supply voltage range; 4 High gain; 5 Low noise.
BA3312N ALC. Datasheet pdf. Equivalent
AM26C32C DATASHEET PDF