From g8mny%gb7cip.#32.gbr.euro@kq6up.ampr.org Sun Jan 5 00:56:48 2025 Received: from kq6up.ampr.org by kq6up.ampr.org (JNOS2.0o.2) with SMTP
id AA52374 ; Sun, 05 Jan 2025 00:56:48 PST
Message-Id: <
23153_GB7CIP@i0ojj.bbs>
From: g8mny@gb7cip.#32.gbr.euro
X-JNOS-User-Port: Circuit (ROMEGW:IR0RM I0OJJ) -> Sending message
From g8mny%gb7cip.#32.gbr.euro@i0ojj.ampr.org Sun Jan 5 09:57:03 2025 Received: from i0ojj.ampr.org by i0ojj.ampr.org (JNOS2.0p.5) with SMTP
id AA17018220 ; Sun, 05 Jan 2025 09:57:03 +0100
Message-Id: <
23153_GB7CIP@gb7cip.bbs>
From: g8mny@gb7cip.#32.gbr.euro
X-JNOS-User-Port: Circuit (CRGWAY:GB7CIP-5 GB7CIP-5) -> Sending message
By G8MNY (Updated Oct 05)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
Here are 2 simply circuits for small discharge current batteries.
1/ On Insulated Heatsink
in ÚÄÄÄÄÄÄÄ¿out 1N4001
+24V >ÄÄÄÂÄÄÄÄÄÄÄÄÄ´ 7805 ÃÄÄÄÄÂÄÄÄÂÄÄÄÄÂÄÄ´>ÃÄÂÄÄ> +14.5V BOOST
³ ÀÄÄÄÂÄÄÄÙ ³ e\³ 22K ³ +13.5V NORMAL
RAW DC >2200u³+ com_³_ ³ PNPÃÄÄÁÄÄ10KÄÙ
FROM 30V=== /_\` u1³ /³
BRIDGE ³ NORMAL ____³ 9.1V === ³ Battery being RECTIFIER ³ O _³_ ³ 1K floated/charged
& 17V AC ³ BOOST \o \_/ 0.5V ³ _³_-> Charge
@ 1.5A ³ ³ _³_ ³ \_/-> LED
³ ³ \_/ 0.5V ³ ³
0V >ÄÄÄÁÄÄÄÄÄÄÄÄÁÄÄÄÄÁÄÄÄÄÄÄÄÄÁÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄ> 0V
Voltage set by Zener + Reg - output diode loss. 13.5V recommended for floating Gel & sealed types. 13.8V for wet ones that can be topped up. 14.5V for charging after discharge, but not left on that voltage!
Current is limited to a peak of 1A. With no I/P smoothing C there will be hum on the charging current & the battery voltage may not be suitable for floating with electronic loads. The output diode voltage drop lets the PNP light the LED when the diode has 0.7V across it. The diode also protects the regulator from reverse voltage if the PSU is off when connected to a live battery.
2/ Add a series R in the common leg. Most makes of regulator put about 50uA constant current down the common leg, so a small R can uplift the voltage.
On Insulated Heatsink
in ÚÄÄÄÄÄÄÄ¿out 1N4001
+22V >ÄÄÄÂÄÄÄÄÄÄ´ 7812 ÃÄÄÂÄÄÄÄÄÄÄ´>ÃÄÄÄ>
RAW DC ³ ÀÄÄÄÂÄÄÄÙ ³
FROM >2200u³+ com³ u1³ Variable
BRIDGE 30V=== Multi 10k === Output
RECTIFIER ³ Turn ³ ³ Voltage
³ ³ ³
0V >ÄÄÄÁÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄ>
I have used this one for many years to float my paket station on a 5AH gel cell battery. Via a fused lead it powers a PacCom TNC220, a FT290R(i), & 30W PA, peak Tx current 8A, Rx 500mA leaving just 500mA to charge for the short packet Tx time.
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
-----------------------------------------
ARGEN-X BBS - IPV6 TELNET LU9DCE.DYNU.COM -----------------------------------------
--- Mystic BBS v1.12 A48 (Linux/64)
* Origin: ARGEN-X BBS (4:902/6)