Recent content by KF4SQB

  1. K

    i need help of this Relay circuit.

    LostViking, I said that, if you had read my entire post. To answer the rest of the original question, "S7" would enable you to 'disable' "RL7" by opening it's common connection, thus preventing it from operating. Also, yes, relays are sometimes rated by the resistance or reactance, both...
  2. K

    i need help of this Relay circuit.

    The dashed lines indicate that two sets of contacts operate "together". In other words, looking at the "appliance#7" part of the circuit in question, the contacts on the right and the contacts on the left are part of the same relay. For instance, both sets of contacts in a DPDT relay. The dashed...
  3. K

    "Tenna" PS-20 power supply

    Does anyone have a schematic of the "Tenna" Phase III PS-20 power supply? If anyone has a schematic for a Pyramid PS-20 supply, it may be the same. This unit is a 120 VAC to 13.8 VDC @ 17A continous (20A surge) power supply with no crowbar or other "protection" circuit. Just a "plain Jane"...
  4. K

    Question for Electrician or Some1 that knows

    That's a good question. I wouldn't have thought that only 3 volts over would've hurt them, but it is possible. A good question at this point is what is the actual, not the rated, output of each power supply? Since you're 12v supply is regulated, it will put out 12v. If the 15v supply isn't...
  5. K

    Need help with LED display circuit

    Thanks for the reply. I do have the regulator heatsinked, but maybe not enough. I'll try removing L2, and adding the bypass caps mentioned, and see if that helps.
  6. K

    Need help with LED display circuit

    Hi, everyone. I've been keeping an eye on the main board for a few years now, but just signed up for the forum. I'm now wishing I'd done this earlier! Anyway, here's my problem: I'm trying to design and build a circuit to use a 5-bit binary input to drive a dual seven-segment LED display. I'm...
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