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  1. bigkim100

    Cannot get this circuit to work

    Ok, here is a Squelch Circuit that I have built, but cannot get it to work (Illustration 1) the input toU1pins 2 and 3 seem to be backwards compared to the standard schematics, (see illustration2) but I dont know. If the schematic seems ok, them I will proceed with rebuilding it. Im mostly...
  2. bigkim100

    XR2006-Sawtooth Amplitude Control

    https://html.alldatasheet.com/html-pdf/80495/EXAR/XR-2206/855/10/XR-2206.html Is there a way to bring the amplitude down to 1-2 volts on the sawtooth output? Thanks in advance Kim
  3. bigkim100

    Schematic Question

    In the attached schematic, are the 2 electrolytic Capacitors, C12 and C13 Correct? being "back to back" polarity seems strange. Thanks in advance
  4. bigkim100

    240VDc supply

    Ok, I need to make a 3 individual 240v/6VDC power supplies for 3 military radios. They dont require much in the way of amperage, and dont require regulation (military stuff is VERY forgiving). So if I have 2-1000uf capacitors smoothing the 240vdc supply after a full wave rectifier, should I...
  5. bigkim100

    Short pulse output

    Is it possible to have a circuit that will output a 2 second pulse no matter what duration a button is pressed? Output switching is to a relay, operating voltage is unimportant, as I will build to whatever your requirements are(eg:3,5,6,9,12vdc). Thanks in advance
  6. bigkim100

    Tube Receiver Audio Matching Transformer

    Ok, have a gnarly ARC-5 Military receiver that requires a 600 Ohm audio output. I dont understand the normal matching transformers that seem to have pinouts that are listed in voltages, rather than resistances. I think a 120vac to 6vac transformer should be 600ohms and 8 ohms...
  7. bigkim100

    Simple delay on

    Looking for a really simple circuit that when triggered by a 3v pulse, it waits for 3 seconds, triggers for 1 second then turns off waiting for the next pulse. 6 or 9vdc operation. Thanks in advance for any help.
  8. bigkim100

    CMOS??

    Is the prefix LM on a 555 indicate if its is a CMOS version? Thanks
  9. bigkim100

    4017 ?

    Is there a way to have a 4017 (driven by an oscillator) to illuminate LEDs from 1-10, or the same LEDs from 10-1 depending on the hi-low output of a 555 timer?. So if a 555 is timing, the leds from the output of a 4017 are illuminating in sequence from 1 to 10 If the 555 is in standby, the...
  10. bigkim100

    Speed control of this circuit

    I found this circuit on Pinterest, and most of those are usually inoperable, once made, so I would like to throw it at you more established players, and see what you think. As well if you think it works, can the speed control of the servo also be added to this?? Thanks in advance
  11. bigkim100

    PERF BOARD!!

    Where can I get IC Pitch Perf Boards, PLAIN, no cladding, no Copper! Remember, Im I Canada, but I often order from the States, and Europe. Its getting progressively more difficult to find. Im an old fart, and I love this stuff to build on!!
  12. bigkim100

    Controlling the speed of my servo

    How do I control the speed of my servo in this project?. Thanks
  13. bigkim100

    Super Simple Home PCB Design Software

    Is there a Super Simple Home PCB Design Software, that I can use for some really basic PCB Boards that I want to make myself ?
  14. bigkim100

    Servo Waving!!

    Ok, I have a really basic Transistor Servo Circuit, to make the Servo move in a CW and CCW direction. https://www.pololu.com/blog/18/simple-hardware-approach-to-controlling-a-servo -I would really like a circuit that will sense the end stop of the CW direction, and then send the Servo in a CCW...
  15. bigkim100

    Pseudo randomness based on this

    Thanks to Bertus, he has sent me to this schematic.(see attachment, simple random sound) Taking into consideration my fevered analogue driven mind is there any way to make it a PSEUDO randomness (when I say random I get jumped on that this way is not TRULY Random) to it without a bucket of...
  16. bigkim100

    convert speaker output to microphone input

    Need to convert speaker output to microphone input on a board. I dont need high quality sound...just something quick and dirty. Thanks in advance
  17. bigkim100

    Simple Waveform Generator Help

    https://www.instructables.com/THE-SIMPLEST-FUNCTION-GENERATOR-BUILT-ON-A-BREADBO/ This is an article about making a single chip Function Generator Only the first stage is adjustable. How do I adjust the 2nd 3rd and 4th generator in it, or can I? Where can I add pots for that stage? Can the...
  18. bigkim100

    Freq Generator

    Ok, Im driving myself crazy trying this, and this is a general statement on my inability to design this...please help! I have frequency generator that i am using to drive whatever this component is called....so my question is...what the hell is this device (supplied in pics) that Im starting to...
  19. bigkim100

    Frequency generator, level adjust

    Im using the xr2206 as a square wave generator, but the voltage output of this is too high. How can I bring the voltage output of this down, without distorting the signal? Thank You
  20. bigkim100

    Servo Stop and Reverse

    There are many different circuit diagrams to run a servo in forward and reverse on the internet. Most deal with using a 555 to generate pulses. I would like to add a way to stop and reverse the servo at a user-defined speed (via Potentiometer), at the end of its path at both ends of the servo...
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