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  1. ramussons

    Electronic Siren

    I remember building a 2 Transistor Siren - Not a 2 tone version, but one that ascends in pitch to a max, and then descends to a very low frequency. This was in the 70's, from a circuit in Popular Electronics (if I recollect correctly). I have gone through the available archives of PE, but not...
  2. ramussons

    Password Reset - PDR-44C1-V

    Someone gave me an old CCTV recorder, a Pinnacle model PDR-44C1-V, in working condition. It does not have a Remote. I need to Reset the DVR to factory settings for further use. I have searched the web, but all the suggested passwords - 000000, 123456, 111111, 222222, .. have not been successful...
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