Re: PUJT valley current?
From: Tony Williams (tonyw_at_ledelec.demon.co.uk)
Date: 02/22/05
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Date: Tue, 22 Feb 2005 09:23:43 +0000 (GMT)
In article <42176E76.9060708@nospam.com>,
Fred Bloggs <nospam@nospam.com> wrote:
> 18.8V
> ,--------[27k]---------------. |
> | | |
> | e |
> | |/ |
> | ,-----------------| pnp [45.7k]
> | | |\ |
> | | | |
> | | +--------|----------+----+
> +-[5.1k]-+-[5.1k]-G |A | | |
> | _\|__ | [220] |
> --- \ /PUT | | |
> - 12v _\_/_ | |/ |
> | |K +-[5.1k]-| npn | 0.022u
> | | | |\e ===C
> | | | | |
> | | [5.1k] | |
> | | | | |
> +-------------------+--------+----------+----+--0v
Since the pnp is const-I that 5.1k in series with
the base of the npn is probably not needed.
When using an external discharge transistor, does the
PUT get forced off when the transistor takes the A-K
voltage below the forward drop of the PUT? Similar to
commutating an SCR?
-- Tony Williams.
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