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From: jeff@abnji.UUCP (jeff)
Newsgroups: net.analog,net.micro
Subject: EPROM power supply needed
Message-ID: <484@abnji.UUCP>
Date: Fri, 29-Mar-85 11:42:24 EST
Article-I.D.: abnji.484
Posted: Fri Mar 29 11:42:24 1985
Date-Received: Sat, 30-Mar-85 01:24:09 EST
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Xref: watmath net.analog:242 net.micro:9864

[spritzensparken!]

	I am currently breadboarding a Z80 and need a power supply to
burn EPROMS.  The 2764 needs a Vpp of 21 volts +/- .5 volts.  It MUST NOT
EXCEED 25 v including overshoot.

	My research found a circuit in Radio Electronics that used a
regulator that has a switched input (a TTL signal turns it on/off),
the rationale being that there will be no transients when turning on/off
since the regulator is designed for that purpose.

	That seems to be the most trustworthy design I've seen, but I
have the yearning to have a DC/DC converter so as to keep the
entrie system +5V only.  Does anyone have an EPROM burner that works on
+5 only? If so,please tell me so we can arrange for me to get the schematic.
Or if you have any information that could help my choice of a
circuit, please pass it on.  Thanks in advance.

				Jeff 'hardware AND software type' Skot
				{ ihnp4 | mcnc | cbosgb} abnji ! jeff