Re: The perils of homebrewing equipment
It's often the simplest circuits that frustrate the most! Last week, I designed and built a complex, auto-balancing telephone coupler for a radio station. It has audio processing to overcome the worst excesses of the telephone network, it automatically adjusts itself for maximum send to receive attenuation ratio and was all built into a 1U 19" rack box. It worked first time and the customer is delighted with the job (and has ordered three more).
The other project last week was a small aluminium box with a couple of XLR connectors (send and receive) and a pair of 3.5mm jack sockets for connection to a computer sound card. It's entirely passive, using little 600Ω : 600Ω audio transformers and a couple of preset resistors for minor tweaking on installation. It allows a telephone channel on an Allen & Heath broadcast desk to connect to a computer for use with Skype. Trivially simple you'd think..... It's been driving me mad for days!
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