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Homemade "B" Battery - I recently purchased a couple of old battery-powered
tube radios on eBay with the idea of using their cases to house a transistor radio
project. But these radios were so nice that I couldn't bring myself ...(electronic
design added 08/08/08)
Lead Acid Battery Charger - Except for use as a normal Battery Charger, this
circuit is perfect to 'constant-charge' a 12-Volt Lead-Acid Battery, like the one in
your flight box, and keep it in optimum charged condition. This circuit is not
recommended for GELL-TYPE batteries since it draws to much current. The above circuit
is a precision voltage source, and contains a temperature sensor with a negative
temperature... (Tony van Roon's electronic circuit added 2/06)
Lead Acid Battery Charger (LM317) - The above pictured schematic diagram is just a
standard constant current model with a added current limiter, consisting of Q1, R1,
and R4. The moment too much current is flowing biases Q1 and drops the output
voltage. The output voltage is: 1.2 x (P1+R2+R3)/R3 volt. Current limiting kicks
in when the current is about 0.6/R1 amp.....(Tony van Roon's schematic / circuit added
08/09)
Lead Acid Battery Charger with Float - The circuit furnishes an initial charge
voltage of 2.5 Volt-per-cell at 25°C to rapidly charge a Lead-Acid battery. The
charging current decreases as the battery charges, and when the current drops to about
180mA, the charging circuit reduces the output voltage to 2.35 Volt-per-cell, floating
the battery in a fully charged state. This lower voltage prevents the battery
from overcharging, which would shorten its life. The LM301A (Tony van Roon's U3)
compares the voltage drop across R1 with an 18-mV reference set by R2. The
comparator's output controls the voltage regulator, forcing it to produce the lower
float voltage when the battery-charging current passing... (Tony van Roon's electronic
design added 2/06)
Lead Acid Charger Gel Cell - This high-performance circuit first quickly starts
(Tony van Roon's and holds) the charge at 2 amp, but as the voltage rises the current
will consequently decrease. When the current falls below 150mA, the charger
automatically switches to a lower 'Float' voltage to prevent overcharging. At the
point that a full charge is reached, Q1 will bias and the LED will light. (Tony van
Roon's electronic design added 2/06)
Lead Acid Charger Signals End of Charge - 09/12/97 EDN-Design Ideas:.....(design
idea added 4/02 /Lead acid Battery Charger that works with either gel or wet Cell,
lead acid,12V Batteries
