Are there any opamps that are particularly suited as tape output buffers? Or would an ad797 work well?
AD797 would work well as tape buffer, provided the series R between output and -ve input is added, as shown in the DS. But it seems rather overkill in a unity gain application given its designed for lowest voltage noise.
Whatever opamp there needs to be some resistance on the output to the jack to isolate the opamp from capacitive loading - normally datasheets suggest a suitable value.
If the input to the buffer is from a volume pot you might need a FET opamp to avoid
scratch noise (bipolar opamps should never be connected to a pot wiper directly, but via a capacitor and separately DC biased).
If the input to the buffer is from a volume pot you might need a FET opamp to avoid
scratch noise (bipolar opamps should never be connected to a pot wiper directly, but via a capacitor and separately DC biased).
This is roughly what I'm looking to do. I'm assuming R3 is necessary. I also just checked and have opa2132 and opa2134 and would probably rather use one of them if they would work. Thanks for the help
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R3 prevents the device jamming to the rail if no input is selected, or if only ac-coupled input is selected. 1M (I presume the 1m is a misprint) resistor is high enough that a FET opamp is probably assumed, 100k might be a wiser choice for bipolar opamp.