Hello,
I would like to buy an affordable audio (pre)amplifier (0Hz to 100Khz) to use as a lab/test equipment (
hobby level).
Ideally this unit would:
- be cheap
- have variable gain settings
- low noise figure
- be capable of amplifying weak signals (<100Khz) up to, say, 10/20V peak to peak (to a high impedance load), with good linear behaviour
- Have some basic low-pass (e.g., <20Khz) and high-pass filters (e.g., >100hz)
One think I'd like to use it, for example, it as audio section in a direct conversion radio.
QUESTION: Do you know of anything with these properties in the audio/music market, or stuff from aliexpress, or good old equipment now available for decent prices in ebay?
I have a nice HP 461A amplifier (linear and +40db) but it's max output is 0.5V (50ohm) and lacks the filtering options, and it is specified to work only on freq. >= 1Khz.
Thank you in advance for any suggestion.