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  1. Replies
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    Re: PIC chips from China, shipped in Styofoam

    The black foam ESD protection material is a carbon loaded foamed polymer with a relatively high bulk conductive value. It also has the property of degrading into a crumbly mess over time, giving off...
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    Re: Help with cleaning of AC please

    Hi
    Thank you for pointing out the error. Although in defense of my mistake, the circuit does come under the heading of "Typical Applications' and is scarce on detail. But..... it does read 120Hz...
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    Re: Help with cleaning of AC please

    Hi
    The circuit on page 22 fig. 7 assumes that you feed it with a smoothed DC filtered supply. The circuit on page 26 fig.18 shows a negative output supply using a positive regulator but shows the...
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    Re: Help with cleaning of AC please

    HI
    THE 0.1UF INPUT AND 0.33UF ON THE O/P OF THE 7805 ARE FOR STABILITY AND LOCAL DEVICE DECOUPLING. IF THEY ARE NOT PRESENT CLOSE TO THE 7805 INSTABILITY MAY OCCUR. IT IS ESSENTIAL THE INPUT SUPPLY...
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    9,222

    Re: Help with cleaning of AC please

    Hi there You did not state the value of the reservoir capacitor after the bridge / zener part of the PSU. If the o/p of this is applied to the 7805 without some large value capacitor to act as a...
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